Finding the Fourth Proportional to 10,986.60, 16,477.92 and 5,438.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,986.60 : 16,477.92 = 5,438.16 : x
2. Step 2: Convert to fraction form
   10,986.60/16,477.92 = 5,438.16/x
3. Step 3: Cross multiply
   10,986.60x = 16,477.92 × 5,438.16
4. Step 4: Simplify right side
   10,986.60x = 89,609,565.43
5. Step 5: Solve for x
   x = 89,609,565.43/10,986.60
6. Step 6: Final answer
   x = 8,156.26