Finding the Fourth Proportional to 11,788.32, 17,679.60 and 7,916.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,788.32 : 17,679.60 = 7,916.16 : x
2. Step 2: Convert to fraction form
   11,788.32/17,679.60 = 7,916.16/x
3. Step 3: Cross multiply
   11,788.32x = 17,679.60 × 7,916.16
4. Step 4: Simplify right side
   11,788.32x = 139,954,542.34
5. Step 5: Solve for x
   x = 139,954,542.34/11,788.32
6. Step 6: Final answer
   x = 11,872.31