Finding the Fourth Proportional to 103,815.32, 143,096.88 and 81,114.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103,815.32 : 143,096.88 = 81,114.72 : x
2. Step 2: Convert to fraction form
   103,815.32/143,096.88 = 81,114.72/x
3. Step 3: Cross multiply
   103,815.32x = 143,096.88 × 81,114.72
4. Step 4: Simplify right side
   103,815.32x = 11,607,263,354.07
5. Step 5: Solve for x
   x = 11,607,263,354.07/103,815.32
6. Step 6: Final answer
   x = 111,806.84