Finding the Fourth Proportional to 8,978.92, 12,397.04 and 5,623.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.92 : 12,397.04 = 5,623.12 : x
2. Step 2: Convert to fraction form
   8,978.92/12,397.04 = 5,623.12/x
3. Step 3: Cross multiply
   8,978.92x = 12,397.04 × 5,623.12
4. Step 4: Simplify right side
   8,978.92x = 69,710,043.56
5. Step 5: Solve for x
   x = 69,710,043.56/8,978.92
6. Step 6: Final answer
   x = 7,763.74