Finding the Fourth Proportional to 12,279.88, 18,404.40 and 5,251.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,279.88 : 18,404.40 = 5,251.63 : x
2. Step 2: Convert to fraction form
   12,279.88/18,404.40 = 5,251.63/x
3. Step 3: Cross multiply
   12,279.88x = 18,404.40 × 5,251.63
4. Step 4: Simplify right side
   12,279.88x = 96,653,029.72
5. Step 5: Solve for x
   x = 96,653,029.72/12,279.88
6. Step 6: Final answer
   x = 7,870.85