Finding the Fourth Proportional to 99,980.91, 137,831.31 and 68,109.03

Step by Step Solution

1. Step 1: Write the proportion equation
   99,980.91 : 137,831.31 = 68,109.03 : x
2. Step 2: Convert to fraction form
   99,980.91/137,831.31 = 68,109.03/x
3. Step 3: Cross multiply
   99,980.91x = 137,831.31 × 68,109.03
4. Step 4: Simplify right side
   99,980.91x = 9,387,556,827.73
5. Step 5: Solve for x
   x = 9,387,556,827.73/99,980.91
6. Step 6: Final answer
   x = 93,893.49