Finding the Fourth Proportional to 91,891.72, 137,891.75 and 38,593.05

Step by Step Solution

1. Step 1: Write the proportion equation
   91,891.72 : 137,891.75 = 38,593.05 : x
2. Step 2: Convert to fraction form
   91,891.72/137,891.75 = 38,593.05/x
3. Step 3: Cross multiply
   91,891.72x = 137,891.75 × 38,593.05
4. Step 4: Simplify right side
   91,891.72x = 5,321,663,009.37
5. Step 5: Solve for x
   x = 5,321,663,009.37/91,891.72
6. Step 6: Final answer
   x = 57,912.32