Finding the Fourth Proportional to 1,200.69, 1,656.95 and 648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.69 : 1,656.95 = 648.69 : x
2. Step 2: Convert to fraction form
   1,200.69/1,656.95 = 648.69/x
3. Step 3: Cross multiply
   1,200.69x = 1,656.95 × 648.69
4. Step 4: Simplify right side
   1,200.69x = 1,074,846.90
5. Step 5: Solve for x
   x = 1,074,846.90/1,200.69
6. Step 6: Final answer
   x = 895.19