Finding the Fourth Proportional to 128,613.13, 177,477.55 and 71,248.59

Step by Step Solution

1. Step 1: Write the proportion equation
   128,613.13 : 177,477.55 = 71,248.59 : x
2. Step 2: Convert to fraction form
   128,613.13/177,477.55 = 71,248.59/x
3. Step 3: Cross multiply
   128,613.13x = 177,477.55 × 71,248.59
4. Step 4: Simplify right side
   128,613.13x = 12,645,025,016.03
5. Step 5: Solve for x
   x = 12,645,025,016.03/128,613.13
6. Step 6: Final answer
   x = 98,318.31