Finding the Fourth Proportional to 9,422.81, 13,002.50 and 5,445.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,422.81 : 13,002.50 = 5,445.20 : x
2. Step 2: Convert to fraction form
   9,422.81/13,002.50 = 5,445.20/x
3. Step 3: Cross multiply
   9,422.81x = 13,002.50 × 5,445.20
4. Step 4: Simplify right side
   9,422.81x = 70,801,120.76
5. Step 5: Solve for x
   x = 70,801,120.76/9,422.81
6. Step 6: Final answer
   x = 7,513.81