Finding the Fourth Proportional to 2,647.94, 3,970.16 and 981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.94 : 3,970.16 = 981.72 : x
2. Step 2: Convert to fraction form
   2,647.94/3,970.16 = 981.72/x
3. Step 3: Cross multiply
   2,647.94x = 3,970.16 × 981.72
4. Step 4: Simplify right side
   2,647.94x = 3,897,589.77
5. Step 5: Solve for x
   x = 3,897,589.77/2,647.94
6. Step 6: Final answer
   x = 1,471.93