Finding the Fourth Proportional to 9,863.88, 13,613.43 and 5,672.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,863.88 : 13,613.43 = 5,672.13 : x
2. Step 2: Convert to fraction form
   9,863.88/13,613.43 = 5,672.13/x
3. Step 3: Cross multiply
   9,863.88x = 13,613.43 × 5,672.13
4. Step 4: Simplify right side
   9,863.88x = 77,217,144.71
5. Step 5: Solve for x
   x = 77,217,144.71/9,863.88
6. Step 6: Final answer
   x = 7,828.27