Finding the Fourth Proportional to 8,499.84, 12,730.32 and 5,379.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.84 : 12,730.32 = 5,379.72 : x
2. Step 2: Convert to fraction form
   8,499.84/12,730.32 = 5,379.72/x
3. Step 3: Cross multiply
   8,499.84x = 12,730.32 × 5,379.72
4. Step 4: Simplify right side
   8,499.84x = 68,485,557.11
5. Step 5: Solve for x
   x = 68,485,557.11/8,499.84
6. Step 6: Final answer
   x = 8,057.28