Finding the Fourth Proportional to 113,654.34, 156,778.74 and 71,139.06

Step by Step Solution

1. Step 1: Write the proportion equation
   113,654.34 : 156,778.74 = 71,139.06 : x
2. Step 2: Convert to fraction form
   113,654.34/156,778.74 = 71,139.06/x
3. Step 3: Cross multiply
   113,654.34x = 156,778.74 × 71,139.06
4. Step 4: Simplify right side
   113,654.34x = 11,153,092,191.58
5. Step 5: Solve for x
   x = 11,153,092,191.58/113,654.34
6. Step 6: Final answer
   x = 98,131.69