Finding the Fourth Proportional to 129,691.72, 178,963.86 and 73,117

Step by Step Solution

1. Step 1: Write the proportion equation
   129,691.72 : 178,963.86 = 73,117 : x
2. Step 2: Convert to fraction form
   129,691.72/178,963.86 = 73,117/x
3. Step 3: Cross multiply
   129,691.72x = 178,963.86 × 73,117
4. Step 4: Simplify right side
   129,691.72x = 13,085,300,551.62
5. Step 5: Solve for x
   x = 13,085,300,551.62/129,691.72
6. Step 6: Final answer
   x = 100,895.42