Finding the Fourth Proportional to 115,504.78, 173,317.89 and 81,987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   115,504.78 : 173,317.89 = 81,987.10 : x
2. Step 2: Convert to fraction form
   115,504.78/173,317.89 = 81,987.10/x
3. Step 3: Cross multiply
   115,504.78x = 173,317.89 × 81,987.10
4. Step 4: Simplify right side
   115,504.78x = 14,209,829,902.69
5. Step 5: Solve for x
   x = 14,209,829,902.69/115,504.78
6. Step 6: Final answer
   x = 123,023.74