Finding the Fourth Proportional to 1,112.42, 1,663.86 and 649.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.42 : 1,663.86 = 649.04 : x
2. Step 2: Convert to fraction form
   1,112.42/1,663.86 = 649.04/x
3. Step 3: Cross multiply
   1,112.42x = 1,663.86 × 649.04
4. Step 4: Simplify right side
   1,112.42x = 1,079,911.69
5. Step 5: Solve for x
   x = 1,079,911.69/1,112.42
6. Step 6: Final answer
   x = 970.78