Finding the Fourth Proportional to 2,670.52, 4,004.56 and 820.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,670.52 : 4,004.56 = 820.99 : x
2. Step 2: Convert to fraction form
   2,670.52/4,004.56 = 820.99/x
3. Step 3: Cross multiply
   2,670.52x = 4,004.56 × 820.99
4. Step 4: Simplify right side
   2,670.52x = 3,287,703.71
5. Step 5: Solve for x
   x = 3,287,703.71/2,670.52
6. Step 6: Final answer
   x = 1,231.11