Finding the Fourth Proportional to 1,641.94, 2,265.86 and 979.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.94 : 2,265.86 = 979.10 : x
2. Step 2: Convert to fraction form
   1,641.94/2,265.86 = 979.10/x
3. Step 3: Cross multiply
   1,641.94x = 2,265.86 × 979.10
4. Step 4: Simplify right side
   1,641.94x = 2,218,503.53
5. Step 5: Solve for x
   x = 2,218,503.53/1,641.94
6. Step 6: Final answer
   x = 1,351.15