Finding the Fourth Proportional to 8,799.29, 12,139.98 and 5,019.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,799.29 : 12,139.98 = 5,019.72 : x
2. Step 2: Convert to fraction form
   8,799.29/12,139.98 = 5,019.72/x
3. Step 3: Cross multiply
   8,799.29x = 12,139.98 × 5,019.72
4. Step 4: Simplify right side
   8,799.29x = 60,939,305.66
5. Step 5: Solve for x
   x = 60,939,305.66/8,799.29
6. Step 6: Final answer
   x = 6,925.48