Finding the Fourth Proportional to 11,426.47, 15,769.30 and 6,391.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,426.47 : 15,769.30 = 6,391.15 : x
2. Step 2: Convert to fraction form
   11,426.47/15,769.30 = 6,391.15/x
3. Step 3: Cross multiply
   11,426.47x = 15,769.30 × 6,391.15
4. Step 4: Simplify right side
   11,426.47x = 100,783,980.02
5. Step 5: Solve for x
   x = 100,783,980.02/11,426.47
6. Step 6: Final answer
   x = 8,820.22