Finding the Fourth Proportional to 13,390.02, 18,479.31 and 7,423.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,390.02 : 18,479.31 = 7,423.59 : x
2. Step 2: Convert to fraction form
   13,390.02/18,479.31 = 7,423.59/x
3. Step 3: Cross multiply
   13,390.02x = 18,479.31 × 7,423.59
4. Step 4: Simplify right side
   13,390.02x = 137,182,862.38
5. Step 5: Solve for x
   x = 137,182,862.38/13,390.02
6. Step 6: Final answer
   x = 10,245.16