Finding the Fourth Proportional to 1,669.27, 2,505.27 and 847.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.27 : 2,505.27 = 847.78 : x
2. Step 2: Convert to fraction form
   1,669.27/2,505.27 = 847.78/x
3. Step 3: Cross multiply
   1,669.27x = 2,505.27 × 847.78
4. Step 4: Simplify right side
   1,669.27x = 2,123,917.80
5. Step 5: Solve for x
   x = 2,123,917.80/1,669.27
6. Step 6: Final answer
   x = 1,272.36