Finding the Fourth Proportional to 820,425,288.72, 1,132,005,906.64 and 485,731,620.12

Step by Step Solution

1. Step 1: Write the proportion equation
   820,425,288.72 : 1,132,005,906.64 = 485,731,620.12 : x
2. Step 2: Convert to fraction form
   820,425,288.72/1,132,005,906.64 = 485,731,620.12/x
3. Step 3: Cross multiply
   820,425,288.72x = 1,132,005,906.64 × 485,731,620.12
4. Step 4: Simplify right side
   820,425,288.72x = 549,851,063,017,656,704
5. Step 5: Solve for x
   x = 549,851,063,017,656,704/820,425,288.72
6. Step 6: Final answer
   x = 670,202,479.83