Finding the Fourth Proportional to 2,647.71, 3,970.80 and 981.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.71 : 3,970.80 = 981.33 : x
2. Step 2: Convert to fraction form
   2,647.71/3,970.80 = 981.33/x
3. Step 3: Cross multiply
   2,647.71x = 3,970.80 × 981.33
4. Step 4: Simplify right side
   2,647.71x = 3,896,665.16
5. Step 5: Solve for x
   x = 3,896,665.16/2,647.71
6. Step 6: Final answer
   x = 1,471.71