Finding the Fourth Proportional to 8,761.40, 12,078.21 and 5,401.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,761.40 : 12,078.21 = 5,401.98 : x
2. Step 2: Convert to fraction form
   8,761.40/12,078.21 = 5,401.98/x
3. Step 3: Cross multiply
   8,761.40x = 12,078.21 × 5,401.98
4. Step 4: Simplify right side
   8,761.40x = 65,246,248.86
5. Step 5: Solve for x
   x = 65,246,248.86/8,761.40
6. Step 6: Final answer
   x = 7,447.02