Finding the Fourth Proportional to 1,042.56, 1,437.90 and 648.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.56 : 1,437.90 = 648.84 : x
2. Step 2: Convert to fraction form
   1,042.56/1,437.90 = 648.84/x
3. Step 3: Cross multiply
   1,042.56x = 1,437.90 × 648.84
4. Step 4: Simplify right side
   1,042.56x = 932,967.04
5. Step 5: Solve for x
   x = 932,967.04/1,042.56
6. Step 6: Final answer
   x = 894.88