Finding the Fourth Proportional to 1,360.79, 1,877.60 and 800.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.79 : 1,877.60 = 800.87 : x
2. Step 2: Convert to fraction form
   1,360.79/1,877.60 = 800.87/x
3. Step 3: Cross multiply
   1,360.79x = 1,877.60 × 800.87
4. Step 4: Simplify right side
   1,360.79x = 1,503,709.51
5. Step 5: Solve for x
   x = 1,503,709.51/1,360.79
6. Step 6: Final answer
   x = 1,105.03