Finding the Fourth Proportional to 2,487.06, 3,729.82 and 820.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.06 : 3,729.82 = 820.87 : x
2. Step 2: Convert to fraction form
   2,487.06/3,729.82 = 820.87/x
3. Step 3: Cross multiply
   2,487.06x = 3,729.82 × 820.87
4. Step 4: Simplify right side
   2,487.06x = 3,061,693.24
5. Step 5: Solve for x
   x = 3,061,693.24/2,487.06
6. Step 6: Final answer
   x = 1,231.05