Finding the Fourth Proportional to 10,139.43, 15,196.59 and 4,591.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.43 : 15,196.59 = 4,591.20 : x
2. Step 2: Convert to fraction form
   10,139.43/15,196.59 = 4,591.20/x
3. Step 3: Cross multiply
   10,139.43x = 15,196.59 × 4,591.20
4. Step 4: Simplify right side
   10,139.43x = 69,770,584.01
5. Step 5: Solve for x
   x = 69,770,584.01/10,139.43
6. Step 6: Final answer
   x = 6,881.12