Finding the Fourth Proportional to 38,881.72, 58,308.24 and 13,915

Step by Step Solution

1. Step 1: Write the proportion equation
   38,881.72 : 58,308.24 = 13,915 : x
2. Step 2: Convert to fraction form
   38,881.72/58,308.24 = 13,915/x
3. Step 3: Cross multiply
   38,881.72x = 58,308.24 × 13,915
4. Step 4: Simplify right side
   38,881.72x = 811,359,159.60
5. Step 5: Solve for x
   x = 811,359,159.60/38,881.72
6. Step 6: Final answer
   x = 20,867.37