Finding the Fourth Proportional to 1,045.56, 1,567.52 and 660

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.56 : 1,567.52 = 660 : x
2. Step 2: Convert to fraction form
   1,045.56/1,567.52 = 660/x
3. Step 3: Cross multiply
   1,045.56x = 1,567.52 × 660
4. Step 4: Simplify right side
   1,045.56x = 1,034,563.20
5. Step 5: Solve for x
   x = 1,034,563.20/1,045.56
6. Step 6: Final answer
   x = 989.48