Finding the Fourth Proportional to 12,479.31, 17,225.04 and 7,379.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,479.31 : 17,225.04 = 7,379.55 : x
2. Step 2: Convert to fraction form
   12,479.31/17,225.04 = 7,379.55/x
3. Step 3: Cross multiply
   12,479.31x = 17,225.04 × 7,379.55
4. Step 4: Simplify right side
   12,479.31x = 127,113,043.93
5. Step 5: Solve for x
   x = 127,113,043.93/12,479.31
6. Step 6: Final answer
   x = 10,185.90