Finding the Fourth Proportional to 1,641.78, 2,265.83 and 1,012.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.78 : 2,265.83 = 1,012.17 : x
2. Step 2: Convert to fraction form
   1,641.78/2,265.83 = 1,012.17/x
3. Step 3: Cross multiply
   1,641.78x = 2,265.83 × 1,012.17
4. Step 4: Simplify right side
   1,641.78x = 2,293,403.89
5. Step 5: Solve for x
   x = 2,293,403.89/1,641.78
6. Step 6: Final answer
   x = 1,396.90