Finding the Fourth Proportional to 1,360.40, 1,874.72 and 917.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.40 : 1,874.72 = 917.53 : x
2. Step 2: Convert to fraction form
   1,360.40/1,874.72 = 917.53/x
3. Step 3: Cross multiply
   1,360.40x = 1,874.72 × 917.53
4. Step 4: Simplify right side
   1,360.40x = 1,720,104.91
5. Step 5: Solve for x
   x = 1,720,104.91/1,360.40
6. Step 6: Final answer
   x = 1,264.41