Finding the Fourth Proportional to 1,410.30, 2,111.40 and 863.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.30 : 2,111.40 = 863.55 : x
2. Step 2: Convert to fraction form
   1,410.30/2,111.40 = 863.55/x
3. Step 3: Cross multiply
   1,410.30x = 2,111.40 × 863.55
4. Step 4: Simplify right side
   1,410.30x = 1,823,299.47
5. Step 5: Solve for x
   x = 1,823,299.47/1,410.30
6. Step 6: Final answer
   x = 1,292.85