Finding the Fourth Proportional to 8,854.72, 12,218.16 and 5,128

Step by Step Solution

1. Step 1: Write the proportion equation
   8,854.72 : 12,218.16 = 5,128 : x
2. Step 2: Convert to fraction form
   8,854.72/12,218.16 = 5,128/x
3. Step 3: Cross multiply
   8,854.72x = 12,218.16 × 5,128
4. Step 4: Simplify right side
   8,854.72x = 62,654,724.48
5. Step 5: Solve for x
   x = 62,654,724.48/8,854.72
6. Step 6: Final answer
   x = 7,075.86