Finding the Fourth Proportional to 8,603.74, 12,898.32 and 3,406.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,603.74 : 12,898.32 = 3,406.78 : x
2. Step 2: Convert to fraction form
   8,603.74/12,898.32 = 3,406.78/x
3. Step 3: Cross multiply
   8,603.74x = 12,898.32 × 3,406.78
4. Step 4: Simplify right side
   8,603.74x = 43,941,738.61
5. Step 5: Solve for x
   x = 43,941,738.61/8,603.74
6. Step 6: Final answer
   x = 5,107.28