Finding the Fourth Proportional to 9,402.22, 12,978.31 and 5,424.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,402.22 : 12,978.31 = 5,424.92 : x
2. Step 2: Convert to fraction form
   9,402.22/12,978.31 = 5,424.92/x
3. Step 3: Cross multiply
   9,402.22x = 12,978.31 × 5,424.92
4. Step 4: Simplify right side
   9,402.22x = 70,406,228.59
5. Step 5: Solve for x
   x = 70,406,228.59/9,402.22
6. Step 6: Final answer
   x = 7,488.26