Finding the Fourth Proportional to 9,402.70, 12,973.80 and 5,422.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,402.70 : 12,973.80 = 5,422.78 : x
2. Step 2: Convert to fraction form
   9,402.70/12,973.80 = 5,422.78/x
3. Step 3: Cross multiply
   9,402.70x = 12,973.80 × 5,422.78
4. Step 4: Simplify right side
   9,402.70x = 70,354,063.16
5. Step 5: Solve for x
   x = 70,354,063.16/9,402.70
6. Step 6: Final answer
   x = 7,482.33