Finding the Fourth Proportional to 9,019.63, 12,442.74 and 5,660.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,019.63 : 12,442.74 = 5,660.78 : x
2. Step 2: Convert to fraction form
   9,019.63/12,442.74 = 5,660.78/x
3. Step 3: Cross multiply
   9,019.63x = 12,442.74 × 5,660.78
4. Step 4: Simplify right side
   9,019.63x = 70,435,613.74
5. Step 5: Solve for x
   x = 70,435,613.74/9,019.63
6. Step 6: Final answer
   x = 7,809.15