Finding the Fourth Proportional to 1,856.49, 2,783.19 and 978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.49 : 2,783.19 = 978.50 : x
2. Step 2: Convert to fraction form
   1,856.49/2,783.19 = 978.50/x
3. Step 3: Cross multiply
   1,856.49x = 2,783.19 × 978.50
4. Step 4: Simplify right side
   1,856.49x = 2,723,337.50
5. Step 5: Solve for x
   x = 2,723,337.50/1,856.49
6. Step 6: Final answer
   x = 1,466.93