Finding the Fourth Proportional to 1,002.78, 1,383.72 and 560.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.78 : 1,383.72 = 560.67 : x
2. Step 2: Convert to fraction form
   1,002.78/1,383.72 = 560.67/x
3. Step 3: Cross multiply
   1,002.78x = 1,383.72 × 560.67
4. Step 4: Simplify right side
   1,002.78x = 775,810.29
5. Step 5: Solve for x
   x = 775,810.29/1,002.78
6. Step 6: Final answer
   x = 773.66