Finding the Fourth Proportional to 1,916.69, 2,874.56 and 820.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,916.69 : 2,874.56 = 820.93 : x
2. Step 2: Convert to fraction form
   1,916.69/2,874.56 = 820.93/x
3. Step 3: Cross multiply
   1,916.69x = 2,874.56 × 820.93
4. Step 4: Simplify right side
   1,916.69x = 2,359,812.54
5. Step 5: Solve for x
   x = 2,359,812.54/1,916.69
6. Step 6: Final answer
   x = 1,231.19