Finding the Fourth Proportional to 91,111.20, 136,685.52 and 38,520.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91,111.20 : 136,685.52 = 38,520.96 : x
2. Step 2: Convert to fraction form
   91,111.20/136,685.52 = 38,520.96/x
3. Step 3: Cross multiply
   91,111.20x = 136,685.52 × 38,520.96
4. Step 4: Simplify right side
   91,111.20x = 5,265,257,448.50
5. Step 5: Solve for x
   x = 5,265,257,448.50/91,111.20
6. Step 6: Final answer
   x = 57,789.35