Finding the Fourth Proportional to 8,780.28, 12,113.34 and 5,417.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.28 : 12,113.34 = 5,417.24 : x
2. Step 2: Convert to fraction form
   8,780.28/12,113.34 = 5,417.24/x
3. Step 3: Cross multiply
   8,780.28x = 12,113.34 × 5,417.24
4. Step 4: Simplify right side
   8,780.28x = 65,620,869.98
5. Step 5: Solve for x
   x = 65,620,869.98/8,780.28
6. Step 6: Final answer
   x = 7,473.66