Finding the Fourth Proportional to 189,630.72, 261,709.92 and 109,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   189,630.72 : 261,709.92 = 109,061.28 : x
2. Step 2: Convert to fraction form
   189,630.72/261,709.92 = 109,061.28/x
3. Step 3: Cross multiply
   189,630.72x = 261,709.92 × 109,061.28
4. Step 4: Simplify right side
   189,630.72x = 28,542,418,863.90
5. Step 5: Solve for x
   x = 28,542,418,863.90/189,630.72
6. Step 6: Final answer
   x = 150,515.80