Finding the Fourth Proportional to 2,670.27, 4,005.98 and 821.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,670.27 : 4,005.98 = 821.34 : x
2. Step 2: Convert to fraction form
   2,670.27/4,005.98 = 821.34/x
3. Step 3: Cross multiply
   2,670.27x = 4,005.98 × 821.34
4. Step 4: Simplify right side
   2,670.27x = 3,290,285.61
5. Step 5: Solve for x
   x = 3,290,285.61/2,670.27
6. Step 6: Final answer
   x = 1,232.19