Finding the Fourth Proportional to 142,083.54, 196,108.90 and 81,689.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142,083.54 : 196,108.90 = 81,689.31 : x
2. Step 2: Convert to fraction form
   142,083.54/196,108.90 = 81,689.31/x
3. Step 3: Cross multiply
   142,083.54x = 196,108.90 × 81,689.31
4. Step 4: Simplify right side
   142,083.54x = 16,020,000,521.64
5. Step 5: Solve for x
   x = 16,020,000,521.64/142,083.54
6. Step 6: Final answer
   x = 112,750.57