Finding the Fourth Proportional to 9,916.72, 13,685.15 and 5,440.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.72 : 13,685.15 = 5,440.43 : x
2. Step 2: Convert to fraction form
   9,916.72/13,685.15 = 5,440.43/x
3. Step 3: Cross multiply
   9,916.72x = 13,685.15 × 5,440.43
4. Step 4: Simplify right side
   9,916.72x = 74,453,148.43
5. Step 5: Solve for x
   x = 74,453,148.43/9,916.72
6. Step 6: Final answer
   x = 7,507.84