Finding the Fourth Proportional to 9,868.34, 13,618.14 and 5,391.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,868.34 : 13,618.14 = 5,391.99 : x
2. Step 2: Convert to fraction form
   9,868.34/13,618.14 = 5,391.99/x
3. Step 3: Cross multiply
   9,868.34x = 13,618.14 × 5,391.99
4. Step 4: Simplify right side
   9,868.34x = 73,428,934.48
5. Step 5: Solve for x
   x = 73,428,934.48/9,868.34
6. Step 6: Final answer
   x = 7,440.86