Finding the Fourth Proportional to 1,377.75, 1,901.26 and 810.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.75 : 1,901.26 = 810.58 : x
2. Step 2: Convert to fraction form
   1,377.75/1,901.26 = 810.58/x
3. Step 3: Cross multiply
   1,377.75x = 1,901.26 × 810.58
4. Step 4: Simplify right side
   1,377.75x = 1,541,123.33
5. Step 5: Solve for x
   x = 1,541,123.33/1,377.75
6. Step 6: Final answer
   x = 1,118.58