Finding the Fourth Proportional to 11,493.42, 15,861.15 and 8,978.46

Step by Step Solution

1. Step 1: Write the proportion equation
   11,493.42 : 15,861.15 = 8,978.46 : x
2. Step 2: Convert to fraction form
   11,493.42/15,861.15 = 8,978.46/x
3. Step 3: Cross multiply
   11,493.42x = 15,861.15 × 8,978.46
4. Step 4: Simplify right side
   11,493.42x = 142,408,700.83
5. Step 5: Solve for x
   x = 142,408,700.83/11,493.42
6. Step 6: Final answer
   x = 12,390.45