Finding the Fourth Proportional to 1,863.81, 2,571.24 and 1,200.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,863.81 : 2,571.24 = 1,200.72 : x
2. Step 2: Convert to fraction form
   1,863.81/2,571.24 = 1,200.72/x
3. Step 3: Cross multiply
   1,863.81x = 2,571.24 × 1,200.72
4. Step 4: Simplify right side
   1,863.81x = 3,087,353.44
5. Step 5: Solve for x
   x = 3,087,353.44/1,863.81
6. Step 6: Final answer
   x = 1,656.47