Finding the Fourth Proportional to 1,200.49, 1,656.86 and 868.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.49 : 1,656.86 = 868.79 : x
2. Step 2: Convert to fraction form
   1,200.49/1,656.86 = 868.79/x
3. Step 3: Cross multiply
   1,200.49x = 1,656.86 × 868.79
4. Step 4: Simplify right side
   1,200.49x = 1,439,463.20
5. Step 5: Solve for x
   x = 1,439,463.20/1,200.49
6. Step 6: Final answer
   x = 1,199.07