Finding the Fourth Proportional to 171,128.48, 236,062.50 and 99,500.58

Step by Step Solution

1. Step 1: Write the proportion equation
   171,128.48 : 236,062.50 = 99,500.58 : x
2. Step 2: Convert to fraction form
   171,128.48/236,062.50 = 99,500.58/x
3. Step 3: Cross multiply
   171,128.48x = 236,062.50 × 99,500.58
4. Step 4: Simplify right side
   171,128.48x = 23,488,355,666.25
5. Step 5: Solve for x
   x = 23,488,355,666.25/171,128.48
6. Step 6: Final answer
   x = 137,255.68