Finding the Fourth Proportional to 1,360.40, 1,876.77 and 917.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.40 : 1,876.77 = 917.55 : x
2. Step 2: Convert to fraction form
   1,360.40/1,876.77 = 917.55/x
3. Step 3: Cross multiply
   1,360.40x = 1,876.77 × 917.55
4. Step 4: Simplify right side
   1,360.40x = 1,722,030.31
5. Step 5: Solve for x
   x = 1,722,030.31/1,360.40
6. Step 6: Final answer
   x = 1,265.83