Finding the Fourth Proportional to 1,387,088.72, 2,080,633.10 and 389,816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,088.72 : 2,080,633.10 = 389,816.72 : x
2. Step 2: Convert to fraction form
   1,387,088.72/2,080,633.10 = 389,816.72/x
3. Step 3: Cross multiply
   1,387,088.72x = 2,080,633.10 × 389,816.72
4. Step 4: Simplify right side
   1,387,088.72x = 811,065,566,015.56
5. Step 5: Solve for x
   x = 811,065,566,015.56/1,387,088.72
6. Step 6: Final answer
   x = 584,725.08