Finding the Fourth Proportional to 8,979.93, 12,388.86 and 5,621.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,979.93 : 12,388.86 = 5,621.31 : x
2. Step 2: Convert to fraction form
   8,979.93/12,388.86 = 5,621.31/x
3. Step 3: Cross multiply
   8,979.93x = 12,388.86 × 5,621.31
4. Step 4: Simplify right side
   8,979.93x = 69,641,622.61
5. Step 5: Solve for x
   x = 69,641,622.61/8,979.93
6. Step 6: Final answer
   x = 7,755.25