Finding the Fourth Proportional to 115,404.57, 172,651.37 and 87,405.30

Step by Step Solution

1. Step 1: Write the proportion equation
   115,404.57 : 172,651.37 = 87,405.30 : x
2. Step 2: Convert to fraction form
   115,404.57/172,651.37 = 87,405.30/x
3. Step 3: Cross multiply
   115,404.57x = 172,651.37 × 87,405.30
4. Step 4: Simplify right side
   115,404.57x = 15,090,644,353.23
5. Step 5: Solve for x
   x = 15,090,644,353.23/115,404.57
6. Step 6: Final answer
   x = 130,762.97