Finding the Fourth Proportional to 1,410.91, 2,118.48 and 865.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.91 : 2,118.48 = 865.37 : x
2. Step 2: Convert to fraction form
   1,410.91/2,118.48 = 865.37/x
3. Step 3: Cross multiply
   1,410.91x = 2,118.48 × 865.37
4. Step 4: Simplify right side
   1,410.91x = 1,833,269.04
5. Step 5: Solve for x
   x = 1,833,269.04/1,410.91
6. Step 6: Final answer
   x = 1,299.35