Finding the Fourth Proportional to 8,463.20, 11,681.72 and 5,478.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,463.20 : 11,681.72 = 5,478.96 : x
2. Step 2: Convert to fraction form
   8,463.20/11,681.72 = 5,478.96/x
3. Step 3: Cross multiply
   8,463.20x = 11,681.72 × 5,478.96
4. Step 4: Simplify right side
   8,463.20x = 64,003,676.61
5. Step 5: Solve for x
   x = 64,003,676.61/8,463.20
6. Step 6: Final answer
   x = 7,562.59