Finding the Fourth Proportional to 1,111.30, 1,664.90 and 649.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.30 : 1,664.90 = 649.30 : x
2. Step 2: Convert to fraction form
   1,111.30/1,664.90 = 649.30/x
3. Step 3: Cross multiply
   1,111.30x = 1,664.90 × 649.30
4. Step 4: Simplify right side
   1,111.30x = 1,081,019.57
5. Step 5: Solve for x
   x = 1,081,019.57/1,111.30
6. Step 6: Final answer
   x = 972.75