Finding the Fourth Proportional to 12,113.55, 18,167.90 and 4,321.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,113.55 : 18,167.90 = 4,321.76 : x
2. Step 2: Convert to fraction form
   12,113.55/18,167.90 = 4,321.76/x
3. Step 3: Cross multiply
   12,113.55x = 18,167.90 × 4,321.76
4. Step 4: Simplify right side
   12,113.55x = 78,517,191.06
5. Step 5: Solve for x
   x = 78,517,191.06/12,113.55
6. Step 6: Final answer
   x = 6,481.77