Finding the Fourth Proportional to 1,900.55, 2,848.55 and 860.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.55 : 2,848.55 = 860.81 : x
2. Step 2: Convert to fraction form
   1,900.55/2,848.55 = 860.81/x
3. Step 3: Cross multiply
   1,900.55x = 2,848.55 × 860.81
4. Step 4: Simplify right side
   1,900.55x = 2,452,041.78
5. Step 5: Solve for x
   x = 2,452,041.78/1,900.55
6. Step 6: Final answer
   x = 1,290.18