Finding the Fourth Proportional to 12,398.10, 18,601.20 and 4,077.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,398.10 : 18,601.20 = 4,077.78 : x
2. Step 2: Convert to fraction form
   12,398.10/18,601.20 = 4,077.78/x
3. Step 3: Cross multiply
   12,398.10x = 18,601.20 × 4,077.78
4. Step 4: Simplify right side
   12,398.10x = 75,851,601.34
5. Step 5: Solve for x
   x = 75,851,601.34/12,398.10
6. Step 6: Final answer
   x = 6,118.00