Finding the Fourth Proportional to 10,366.16, 15,554.80 and 7,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,366.16 : 15,554.80 = 7,916.72 : x
2. Step 2: Convert to fraction form
   10,366.16/15,554.80 = 7,916.72/x
3. Step 3: Cross multiply
   10,366.16x = 15,554.80 × 7,916.72
4. Step 4: Simplify right side
   10,366.16x = 123,142,996.26
5. Step 5: Solve for x
   x = 123,142,996.26/10,366.16
6. Step 6: Final answer
   x = 11,879.33