Finding the Fourth Proportional to 9,402.72, 12,973.78 and 5,422.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,402.72 : 12,973.78 = 5,422.80 : x
2. Step 2: Convert to fraction form
   9,402.72/12,973.78 = 5,422.80/x
3. Step 3: Cross multiply
   9,402.72x = 12,973.78 × 5,422.80
4. Step 4: Simplify right side
   9,402.72x = 70,354,214.18
5. Step 5: Solve for x
   x = 70,354,214.18/9,402.72
6. Step 6: Final answer
   x = 7,482.33