Finding the Fourth Proportional to 161,638.72, 242,516.52 and 82,790.08

Step by Step Solution

1. Step 1: Write the proportion equation
   161,638.72 : 242,516.52 = 82,790.08 : x
2. Step 2: Convert to fraction form
   161,638.72/242,516.52 = 82,790.08/x
3. Step 3: Cross multiply
   161,638.72x = 242,516.52 × 82,790.08
4. Step 4: Simplify right side
   161,638.72x = 20,077,962,092.12
5. Step 5: Solve for x
   x = 20,077,962,092.12/161,638.72
6. Step 6: Final answer
   x = 124,215.05