Finding the Fourth Proportional to 9,916.56, 13,684.62 and 5,440.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.56 : 13,684.62 = 5,440.20 : x
2. Step 2: Convert to fraction form
   9,916.56/13,684.62 = 5,440.20/x
3. Step 3: Cross multiply
   9,916.56x = 13,684.62 × 5,440.20
4. Step 4: Simplify right side
   9,916.56x = 74,447,069.72
5. Step 5: Solve for x
   x = 74,447,069.72/9,916.56
6. Step 6: Final answer
   x = 7,507.35