Finding the Fourth Proportional to 2,978.50, 4,468.50 and 926.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.50 : 4,468.50 = 926.50 : x
2. Step 2: Convert to fraction form
   2,978.50/4,468.50 = 926.50/x
3. Step 3: Cross multiply
   2,978.50x = 4,468.50 × 926.50
4. Step 4: Simplify right side
   2,978.50x = 4,140,065.25
5. Step 5: Solve for x
   x = 4,140,065.25/2,978.50
6. Step 6: Final answer
   x = 1,389.98