Finding the Fourth Proportional to 2,138.56, 3,205.38 and 981.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.56 : 3,205.38 = 981.88 : x
2. Step 2: Convert to fraction form
   2,138.56/3,205.38 = 981.88/x
3. Step 3: Cross multiply
   2,138.56x = 3,205.38 × 981.88
4. Step 4: Simplify right side
   2,138.56x = 3,147,298.51
5. Step 5: Solve for x
   x = 3,147,298.51/2,138.56
6. Step 6: Final answer
   x = 1,471.69