Finding the Fourth Proportional to 9,401.42, 12,970.78 and 5,422.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,401.42 : 12,970.78 = 5,422.43 : x
2. Step 2: Convert to fraction form
   9,401.42/12,970.78 = 5,422.43/x
3. Step 3: Cross multiply
   9,401.42x = 12,970.78 × 5,422.43
4. Step 4: Simplify right side
   9,401.42x = 70,333,146.60
5. Step 5: Solve for x
   x = 70,333,146.60/9,401.42
6. Step 6: Final answer
   x = 7,481.12