Finding the Fourth Proportional to 1,663.94, 2,494.47 and 978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.94 : 2,494.47 = 978.50 : x
2. Step 2: Convert to fraction form
   1,663.94/2,494.47 = 978.50/x
3. Step 3: Cross multiply
   1,663.94x = 2,494.47 × 978.50
4. Step 4: Simplify right side
   1,663.94x = 2,440,838.90
5. Step 5: Solve for x
   x = 2,440,838.90/1,663.94
6. Step 6: Final answer
   x = 1,466.90