Finding the Fourth Proportional to 1,410.61, 2,118.33 and 917.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.61 : 2,118.33 = 917.86 : x
2. Step 2: Convert to fraction form
   1,410.61/2,118.33 = 917.86/x
3. Step 3: Cross multiply
   1,410.61x = 2,118.33 × 917.86
4. Step 4: Simplify right side
   1,410.61x = 1,944,325.78
5. Step 5: Solve for x
   x = 1,944,325.78/1,410.61
6. Step 6: Final answer
   x = 1,378.36