Finding the Fourth Proportional to 1,571.55, 2,168.76 and 863.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.55 : 2,168.76 = 863.46 : x
2. Step 2: Convert to fraction form
   1,571.55/2,168.76 = 863.46/x
3. Step 3: Cross multiply
   1,571.55x = 2,168.76 × 863.46
4. Step 4: Simplify right side
   1,571.55x = 1,872,637.51
5. Step 5: Solve for x
   x = 1,872,637.51/1,571.55
6. Step 6: Final answer
   x = 1,191.59