Finding the Fourth Proportional to 1,111.73, 1,668.57 and 648.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.73 : 1,668.57 = 648.87 : x
2. Step 2: Convert to fraction form
   1,111.73/1,668.57 = 648.87/x
3. Step 3: Cross multiply
   1,111.73x = 1,668.57 × 648.87
4. Step 4: Simplify right side
   1,111.73x = 1,082,685.02
5. Step 5: Solve for x
   x = 1,082,685.02/1,111.73
6. Step 6: Final answer
   x = 973.87