Finding the Fourth Proportional to 2,648.60, 3,971.63 and 981.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.60 : 3,971.63 = 981.59 : x
2. Step 2: Convert to fraction form
   2,648.60/3,971.63 = 981.59/x
3. Step 3: Cross multiply
   2,648.60x = 3,971.63 × 981.59
4. Step 4: Simplify right side
   2,648.60x = 3,898,494.89
5. Step 5: Solve for x
   x = 3,898,494.89/2,648.60
6. Step 6: Final answer
   x = 1,471.91