Finding the Fourth Proportional to 9,939.16, 13,715.95 and 5,401.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,939.16 : 13,715.95 = 5,401.79 : x
2. Step 2: Convert to fraction form
   9,939.16/13,715.95 = 5,401.79/x
3. Step 3: Cross multiply
   9,939.16x = 13,715.95 × 5,401.79
4. Step 4: Simplify right side
   9,939.16x = 74,090,681.55
5. Step 5: Solve for x
   x = 74,090,681.55/9,939.16
6. Step 6: Final answer
   x = 7,454.42