Finding the Fourth Proportional to 258,520.02, 387,784.89 and 81,023.10

Step by Step Solution

1. Step 1: Write the proportion equation
   258,520.02 : 387,784.89 = 81,023.10 : x
2. Step 2: Convert to fraction form
   258,520.02/387,784.89 = 81,023.10/x
3. Step 3: Cross multiply
   258,520.02x = 387,784.89 × 81,023.10
4. Step 4: Simplify right side
   258,520.02x = 31,419,533,920.96
5. Step 5: Solve for x
   x = 31,419,533,920.96/258,520.02
6. Step 6: Final answer
   x = 121,536.17