Finding the Fourth Proportional to 1,340.69, 2,010.81 and 820.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.69 : 2,010.81 = 820.50 : x
2. Step 2: Convert to fraction form
   1,340.69/2,010.81 = 820.50/x
3. Step 3: Cross multiply
   1,340.69x = 2,010.81 × 820.50
4. Step 4: Simplify right side
   1,340.69x = 1,649,869.61
5. Step 5: Solve for x
   x = 1,649,869.61/1,340.69
6. Step 6: Final answer
   x = 1,230.62