Finding the Fourth Proportional to 28,018.18, 42,021.33 and 9,293.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,018.18 : 42,021.33 = 9,293.86 : x
2. Step 2: Convert to fraction form
   28,018.18/42,021.33 = 9,293.86/x
3. Step 3: Cross multiply
   28,018.18x = 42,021.33 × 9,293.86
4. Step 4: Simplify right side
   28,018.18x = 390,540,358.03
5. Step 5: Solve for x
   x = 390,540,358.03/28,018.18
6. Step 6: Final answer
   x = 13,938.82