Finding the Fourth Proportional to 1,377.95, 2,064.76 and 821.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.95 : 2,064.76 = 821.58 : x
2. Step 2: Convert to fraction form
   1,377.95/2,064.76 = 821.58/x
3. Step 3: Cross multiply
   1,377.95x = 2,064.76 × 821.58
4. Step 4: Simplify right side
   1,377.95x = 1,696,355.72
5. Step 5: Solve for x
   x = 1,696,355.72/1,377.95
6. Step 6: Final answer
   x = 1,231.08