Finding the Fourth Proportional to 9,916.73, 13,685.22 and 5,440.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.73 : 13,685.22 = 5,440.40 : x
2. Step 2: Convert to fraction form
   9,916.73/13,685.22 = 5,440.40/x
3. Step 3: Cross multiply
   9,916.73x = 13,685.22 × 5,440.40
4. Step 4: Simplify right side
   9,916.73x = 74,453,002.46
5. Step 5: Solve for x
   x = 74,453,002.46/9,916.73
6. Step 6: Final answer
   x = 7,507.82