Finding the Fourth Proportional to 39,721.34, 59,581.95 and 10,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   39,721.34 : 59,581.95 = 10,139.18 : x
2. Step 2: Convert to fraction form
   39,721.34/59,581.95 = 10,139.18/x
3. Step 3: Cross multiply
   39,721.34x = 59,581.95 × 10,139.18
4. Step 4: Simplify right side
   39,721.34x = 604,111,817.89
5. Step 5: Solve for x
   x = 604,111,817.89/39,721.34
6. Step 6: Final answer
   x = 15,208.75