Finding the Fourth Proportional to 39,018.76, 58,530.79 and 13,715.20

Step by Step Solution

1. Step 1: Write the proportion equation
   39,018.76 : 58,530.79 = 13,715.20 : x
2. Step 2: Convert to fraction form
   39,018.76/58,530.79 = 13,715.20/x
3. Step 3: Cross multiply
   39,018.76x = 58,530.79 × 13,715.20
4. Step 4: Simplify right side
   39,018.76x = 802,761,456.72
5. Step 5: Solve for x
   x = 802,761,456.72/39,018.76
6. Step 6: Final answer
   x = 20,573.73