Finding the Fourth Proportional to 1,863.96, 2,570.80 and 1,200.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,863.96 : 2,570.80 = 1,200.88 : x
2. Step 2: Convert to fraction form
   1,863.96/2,570.80 = 1,200.88/x
3. Step 3: Cross multiply
   1,863.96x = 2,570.80 × 1,200.88
4. Step 4: Simplify right side
   1,863.96x = 3,087,222.30
5. Step 5: Solve for x
   x = 3,087,222.30/1,863.96
6. Step 6: Final answer
   x = 1,656.27