Finding the Fourth Proportional to 1,641.03, 2,265.17 and 978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.03 : 2,265.17 = 978.09 : x
2. Step 2: Convert to fraction form
   1,641.03/2,265.17 = 978.09/x
3. Step 3: Cross multiply
   1,641.03x = 2,265.17 × 978.09
4. Step 4: Simplify right side
   1,641.03x = 2,215,535.23
5. Step 5: Solve for x
   x = 2,215,535.23/1,641.03
6. Step 6: Final answer
   x = 1,350.09