Finding the Fourth Proportional to 10,139.31, 15,194.39 and 4,287.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.31 : 15,194.39 = 4,287.87 : x
2. Step 2: Convert to fraction form
   10,139.31/15,194.39 = 4,287.87/x
3. Step 3: Cross multiply
   10,139.31x = 15,194.39 × 4,287.87
4. Step 4: Simplify right side
   10,139.31x = 65,151,547.61
5. Step 5: Solve for x
   x = 65,151,547.61/10,139.31
6. Step 6: Final answer
   x = 6,425.64