Finding the Fourth Proportional to 1,068.51, 1,474.56 and 648.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.51 : 1,474.56 = 648.78 : x
2. Step 2: Convert to fraction form
   1,068.51/1,474.56 = 648.78/x
3. Step 3: Cross multiply
   1,068.51x = 1,474.56 × 648.78
4. Step 4: Simplify right side
   1,068.51x = 956,665.04
5. Step 5: Solve for x
   x = 956,665.04/1,068.51
6. Step 6: Final answer
   x = 895.33