Finding the Fourth Proportional to 1,641.67, 2,265.71 and 978.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.67 : 2,265.71 = 978.52 : x
2. Step 2: Convert to fraction form
   1,641.67/2,265.71 = 978.52/x
3. Step 3: Cross multiply
   1,641.67x = 2,265.71 × 978.52
4. Step 4: Simplify right side
   1,641.67x = 2,217,042.55
5. Step 5: Solve for x
   x = 2,217,042.55/1,641.67
6. Step 6: Final answer
   x = 1,350.48