Finding the Fourth Proportional to 1,380.97, 2,061.34 and 1,216.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.97 : 2,061.34 = 1,216.94 : x
2. Step 2: Convert to fraction form
   1,380.97/2,061.34 = 1,216.94/x
3. Step 3: Cross multiply
   1,380.97x = 2,061.34 × 1,216.94
4. Step 4: Simplify right side
   1,380.97x = 2,508,527.10
5. Step 5: Solve for x
   x = 2,508,527.10/1,380.97
6. Step 6: Final answer
   x = 1,816.50