Finding the Fourth Proportional to 647,499.60, 891,516.12 and 550,512.72

Step by Step Solution

1. Step 1: Write the proportion equation
   647,499.60 : 891,516.12 = 550,512.72 : x
2. Step 2: Convert to fraction form
   647,499.60/891,516.12 = 550,512.72/x
3. Step 3: Cross multiply
   647,499.60x = 891,516.12 × 550,512.72
4. Step 4: Simplify right side
   647,499.60x = 490,790,964,145.05
5. Step 5: Solve for x
   x = 490,790,964,145.05/647,499.60
6. Step 6: Final answer
   x = 757,978.79