Finding the Fourth Proportional to 1,811.50, 2,718.27 and 978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.50 : 2,718.27 = 978.55 : x
2. Step 2: Convert to fraction form
   1,811.50/2,718.27 = 978.55/x
3. Step 3: Cross multiply
   1,811.50x = 2,718.27 × 978.55
4. Step 4: Simplify right side
   1,811.50x = 2,659,963.11
5. Step 5: Solve for x
   x = 2,659,963.11/1,811.50
6. Step 6: Final answer
   x = 1,468.38