Finding the Fourth Proportional to 38,399.57, 57,590.71 and 13,775.57

Step by Step Solution

1. Step 1: Write the proportion equation
   38,399.57 : 57,590.71 = 13,775.57 : x
2. Step 2: Convert to fraction form
   38,399.57/57,590.71 = 13,775.57/x
3. Step 3: Cross multiply
   38,399.57x = 57,590.71 × 13,775.57
4. Step 4: Simplify right side
   38,399.57x = 793,344,856.95
5. Step 5: Solve for x
   x = 793,344,856.95/38,399.57
6. Step 6: Final answer
   x = 20,660.25