Finding the Fourth Proportional to 1,800.53, 2,700.78 and 978.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,800.53 : 2,700.78 = 978.62 : x
2. Step 2: Convert to fraction form
   1,800.53/2,700.78 = 978.62/x
3. Step 3: Cross multiply
   1,800.53x = 2,700.78 × 978.62
4. Step 4: Simplify right side
   1,800.53x = 2,643,020.15
5. Step 5: Solve for x
   x = 2,643,020.15/1,800.53
6. Step 6: Final answer
   x = 1,467.91