Finding the Fourth Proportional to 10,987.55, 15,162.90 and 5,951.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,987.55 : 15,162.90 = 5,951.78 : x
2. Step 2: Convert to fraction form
   10,987.55/15,162.90 = 5,951.78/x
3. Step 3: Cross multiply
   10,987.55x = 15,162.90 × 5,951.78
4. Step 4: Simplify right side
   10,987.55x = 90,246,203.69
5. Step 5: Solve for x
   x = 90,246,203.69/10,987.55
6. Step 6: Final answer
   x = 8,213.50