Finding the Fourth Proportional to 52,086.74, 78,123.91 and 13,615.70

Step by Step Solution

1. Step 1: Write the proportion equation
   52,086.74 : 78,123.91 = 13,615.70 : x
2. Step 2: Convert to fraction form
   52,086.74/78,123.91 = 13,615.70/x
3. Step 3: Cross multiply
   52,086.74x = 78,123.91 × 13,615.70
4. Step 4: Simplify right side
   52,086.74x = 1,063,711,721.39
5. Step 5: Solve for x
   x = 1,063,711,721.39/52,086.74
6. Step 6: Final answer
   x = 20,421.93