Finding the Fourth Proportional to 13,390.45, 18,479.25 and 7,422.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,390.45 : 18,479.25 = 7,422.52 : x
2. Step 2: Convert to fraction form
   13,390.45/18,479.25 = 7,422.52/x
3. Step 3: Cross multiply
   13,390.45x = 18,479.25 × 7,422.52
4. Step 4: Simplify right side
   13,390.45x = 137,162,602.71
5. Step 5: Solve for x
   x = 137,162,602.71/13,390.45
6. Step 6: Final answer
   x = 10,243.32