Finding the Fourth Proportional to 12,393.72, 18,586.64 and 4,071.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,393.72 : 18,586.64 = 4,071.78 : x
2. Step 2: Convert to fraction form
   12,393.72/18,586.64 = 4,071.78/x
3. Step 3: Cross multiply
   12,393.72x = 18,586.64 × 4,071.78
4. Step 4: Simplify right side
   12,393.72x = 75,680,719.20
5. Step 5: Solve for x
   x = 75,680,719.20/12,393.72
6. Step 6: Final answer
   x = 6,106.38