Finding the Fourth Proportional to 38,931.28, 58,404.18 and 12,632.56

Step by Step Solution

1. Step 1: Write the proportion equation
   38,931.28 : 58,404.18 = 12,632.56 : x
2. Step 2: Convert to fraction form
   38,931.28/58,404.18 = 12,632.56/x
3. Step 3: Cross multiply
   38,931.28x = 58,404.18 × 12,632.56
4. Step 4: Simplify right side
   38,931.28x = 737,794,308.10
5. Step 5: Solve for x
   x = 737,794,308.10/38,931.28
6. Step 6: Final answer
   x = 18,951.20