Finding the Fourth Proportional to 9,916.98, 13,685.57 and 5,440.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.98 : 13,685.57 = 5,440.65 : x
2. Step 2: Convert to fraction form
   9,916.98/13,685.57 = 5,440.65/x
3. Step 3: Cross multiply
   9,916.98x = 13,685.57 × 5,440.65
4. Step 4: Simplify right side
   9,916.98x = 74,458,300.79
5. Step 5: Solve for x
   x = 74,458,300.79/9,916.98
6. Step 6: Final answer
   x = 7,508.17