Finding the Fourth Proportional to 103,381.92, 142,807.86 and 81,004.05

Step by Step Solution

1. Step 1: Write the proportion equation
   103,381.92 : 142,807.86 = 81,004.05 : x
2. Step 2: Convert to fraction form
   103,381.92/142,807.86 = 81,004.05/x
3. Step 3: Cross multiply
   103,381.92x = 142,807.86 × 81,004.05
4. Step 4: Simplify right side
   103,381.92x = 11,568,015,031.83
5. Step 5: Solve for x
   x = 11,568,015,031.83/103,381.92
6. Step 6: Final answer
   x = 111,895.92