Finding the Fourth Proportional to 127,728.83, 191,634.29 and 38,991.30

Step by Step Solution

1. Step 1: Write the proportion equation
   127,728.83 : 191,634.29 = 38,991.30 : x
2. Step 2: Convert to fraction form
   127,728.83/191,634.29 = 38,991.30/x
3. Step 3: Cross multiply
   127,728.83x = 191,634.29 × 38,991.30
4. Step 4: Simplify right side
   127,728.83x = 7,472,069,896.72
5. Step 5: Solve for x
   x = 7,472,069,896.72/127,728.83
6. Step 6: Final answer
   x = 58,499.48