Finding the Fourth Proportional to 13,390.01, 18,478.22 and 7,422.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,390.01 : 18,478.22 = 7,422.07 : x
2. Step 2: Convert to fraction form
   13,390.01/18,478.22 = 7,422.07/x
3. Step 3: Cross multiply
   13,390.01x = 18,478.22 × 7,422.07
4. Step 4: Simplify right side
   13,390.01x = 137,146,642.32
5. Step 5: Solve for x
   x = 137,146,642.32/13,390.01
6. Step 6: Final answer
   x = 10,242.46