Finding the Fourth Proportional to 12,407.17, 18,613.43 and 4,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,407.17 : 18,613.43 = 4,086.78 : x
2. Step 2: Convert to fraction form
   12,407.17/18,613.43 = 4,086.78/x
3. Step 3: Cross multiply
   12,407.17x = 18,613.43 × 4,086.78
4. Step 4: Simplify right side
   12,407.17x = 76,069,003.67
5. Step 5: Solve for x
   x = 76,069,003.67/12,407.17
6. Step 6: Final answer
   x = 6,131.05