Finding the Fourth Proportional to 12,279.78, 18,404.17 and 5,251.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,279.78 : 18,404.17 = 5,251.48 : x
2. Step 2: Convert to fraction form
   12,279.78/18,404.17 = 5,251.48/x
3. Step 3: Cross multiply
   12,279.78x = 18,404.17 × 5,251.48
4. Step 4: Simplify right side
   12,279.78x = 96,649,130.67
5. Step 5: Solve for x
   x = 96,649,130.67/12,279.78
6. Step 6: Final answer
   x = 7,870.59