Finding the Fourth Proportional to 2,623.18, 3,932.33 and 978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.18 : 3,932.33 = 978.47 : x
2. Step 2: Convert to fraction form
   2,623.18/3,932.33 = 978.47/x
3. Step 3: Cross multiply
   2,623.18x = 3,932.33 × 978.47
4. Step 4: Simplify right side
   2,623.18x = 3,847,666.94
5. Step 5: Solve for x
   x = 3,847,666.94/2,623.18
6. Step 6: Final answer
   x = 1,466.80