Finding the Fourth Proportional to 127,689.72, 191,703.86 and 109,089.28

Step by Step Solution

1. Step 1: Write the proportion equation
   127,689.72 : 191,703.86 = 109,089.28 : x
2. Step 2: Convert to fraction form
   127,689.72/191,703.86 = 109,089.28/x
3. Step 3: Cross multiply
   127,689.72x = 191,703.86 × 109,089.28
4. Step 4: Simplify right side
   127,689.72x = 20,912,836,060.62
5. Step 5: Solve for x
   x = 20,912,836,060.62/127,689.72
6. Step 6: Final answer
   x = 163,778.54