Finding the Fourth Proportional to 1,806.15, 2,492.49 and 978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,806.15 : 2,492.49 = 978.15 : x
2. Step 2: Convert to fraction form
   1,806.15/2,492.49 = 978.15/x
3. Step 3: Cross multiply
   1,806.15x = 2,492.49 × 978.15
4. Step 4: Simplify right side
   1,806.15x = 2,438,024.20
5. Step 5: Solve for x
   x = 2,438,024.20/1,806.15
6. Step 6: Final answer
   x = 1,349.85