Finding the Fourth Proportional to 142,781.91, 196,983.57 and 91,787.76

Step by Step Solution

1. Step 1: Write the proportion equation
   142,781.91 : 196,983.57 = 91,787.76 : x
2. Step 2: Convert to fraction form
   142,781.91/196,983.57 = 91,787.76/x
3. Step 3: Cross multiply
   142,781.91x = 196,983.57 × 91,787.76
4. Step 4: Simplify right side
   142,781.91x = 18,080,680,647.10
5. Step 5: Solve for x
   x = 18,080,680,647.10/142,781.91
6. Step 6: Final answer
   x = 126,631.45