Finding the Fourth Proportional to 1,200.50, 1,656.69 and 648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.50 : 1,656.69 = 648.50 : x
2. Step 2: Convert to fraction form
   1,200.50/1,656.69 = 648.50/x
3. Step 3: Cross multiply
   1,200.50x = 1,656.69 × 648.50
4. Step 4: Simplify right side
   1,200.50x = 1,074,363.47
5. Step 5: Solve for x
   x = 1,074,363.47/1,200.50
6. Step 6: Final answer
   x = 894.93