Finding the Fourth Proportional to 2,622.50, 3,933.96 and 978.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.50 : 3,933.96 = 978.66 : x
2. Step 2: Convert to fraction form
   2,622.50/3,933.96 = 978.66/x
3. Step 3: Cross multiply
   2,622.50x = 3,933.96 × 978.66
4. Step 4: Simplify right side
   2,622.50x = 3,850,009.29
5. Step 5: Solve for x
   x = 3,850,009.29/2,622.50
6. Step 6: Final answer
   x = 1,468.07