Finding the Fourth Proportional to 2,117.05, 3,173.94 and 800.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.05 : 3,173.94 = 800.78 : x
2. Step 2: Convert to fraction form
   2,117.05/3,173.94 = 800.78/x
3. Step 3: Cross multiply
   2,117.05x = 3,173.94 × 800.78
4. Step 4: Simplify right side
   2,117.05x = 2,541,611.80
5. Step 5: Solve for x
   x = 2,541,611.80/2,117.05
6. Step 6: Final answer
   x = 1,200.55