Finding the Fourth Proportional to 2,488.06, 3,731.31 and 821.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.06 : 3,731.31 = 821.87 : x
2. Step 2: Convert to fraction form
   2,488.06/3,731.31 = 821.87/x
3. Step 3: Cross multiply
   2,488.06x = 3,731.31 × 821.87
4. Step 4: Simplify right side
   2,488.06x = 3,066,651.75
5. Step 5: Solve for x
   x = 3,066,651.75/2,488.06
6. Step 6: Final answer
   x = 1,232.55