Finding the Fourth Proportional to 8,752.91, 13,131.42 and 5,379.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,752.91 : 13,131.42 = 5,379.47 : x
2. Step 2: Convert to fraction form
   8,752.91/13,131.42 = 5,379.47/x
3. Step 3: Cross multiply
   8,752.91x = 13,131.42 × 5,379.47
4. Step 4: Simplify right side
   8,752.91x = 70,640,014.29
5. Step 5: Solve for x
   x = 70,640,014.29/8,752.91
6. Step 6: Final answer
   x = 8,070.46