Finding the Fourth Proportional to 9,021.64, 12,445.50 and 5,662.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,021.64 : 12,445.50 = 5,662.78 : x
2. Step 2: Convert to fraction form
   9,021.64/12,445.50 = 5,662.78/x
3. Step 3: Cross multiply
   9,021.64x = 12,445.50 × 5,662.78
4. Step 4: Simplify right side
   9,021.64x = 70,476,128.49
5. Step 5: Solve for x
   x = 70,476,128.49/9,021.64
6. Step 6: Final answer
   x = 7,811.90