Finding the Fourth Proportional to 1,806.50, 2,492.98 and 978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,806.50 : 2,492.98 = 978.50 : x
2. Step 2: Convert to fraction form
   1,806.50/2,492.98 = 978.50/x
3. Step 3: Cross multiply
   1,806.50x = 2,492.98 × 978.50
4. Step 4: Simplify right side
   1,806.50x = 2,439,380.93
5. Step 5: Solve for x
   x = 2,439,380.93/1,806.50
6. Step 6: Final answer
   x = 1,350.34