Finding the Fourth Proportional to 128,146.50, 176,841.42 and 71,557.92

Step by Step Solution

1. Step 1: Write the proportion equation
   128,146.50 : 176,841.42 = 71,557.92 : x
2. Step 2: Convert to fraction form
   128,146.50/176,841.42 = 71,557.92/x
3. Step 3: Cross multiply
   128,146.50x = 176,841.42 × 71,557.92
4. Step 4: Simplify right side
   128,146.50x = 12,654,404,185.05
5. Step 5: Solve for x
   x = 12,654,404,185.05/128,146.50
6. Step 6: Final answer
   x = 98,749.51