Finding the Fourth Proportional to 1,215.98, 1,822.25 and 940.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.98 : 1,822.25 = 940.78 : x
2. Step 2: Convert to fraction form
   1,215.98/1,822.25 = 940.78/x
3. Step 3: Cross multiply
   1,215.98x = 1,822.25 × 940.78
4. Step 4: Simplify right side
   1,215.98x = 1,714,335.69
5. Step 5: Solve for x
   x = 1,714,335.69/1,215.98
6. Step 6: Final answer
   x = 1,409.84