Finding the Fourth Proportional to 38,238.72, 57,375.24 and 20,688

Step by Step Solution

1. Step 1: Write the proportion equation
   38,238.72 : 57,375.24 = 20,688 : x
2. Step 2: Convert to fraction form
   38,238.72/57,375.24 = 20,688/x
3. Step 3: Cross multiply
   38,238.72x = 57,375.24 × 20,688
4. Step 4: Simplify right side
   38,238.72x = 1,186,978,965.12
5. Step 5: Solve for x
   x = 1,186,978,965.12/38,238.72
6. Step 6: Final answer
   x = 31,041.28