Finding the Fourth Proportional to 10,139.31, 15,210.18 and 3,899.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.31 : 15,210.18 = 3,899.07 : x
2. Step 2: Convert to fraction form
   10,139.31/15,210.18 = 3,899.07/x
3. Step 3: Cross multiply
   10,139.31x = 15,210.18 × 3,899.07
4. Step 4: Simplify right side
   10,139.31x = 59,305,556.53
5. Step 5: Solve for x
   x = 59,305,556.53/10,139.31
6. Step 6: Final answer
   x = 5,849.07