Finding the Fourth Proportional to 13,090.86, 18,065.34 and 7,122.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,090.86 : 18,065.34 = 7,122.42 : x
2. Step 2: Convert to fraction form
   13,090.86/18,065.34 = 7,122.42/x
3. Step 3: Cross multiply
   13,090.86x = 18,065.34 × 7,122.42
4. Step 4: Simplify right side
   13,090.86x = 128,668,938.92
5. Step 5: Solve for x
   x = 128,668,938.92/13,090.86
6. Step 6: Final answer
   x = 9,828.91