Finding the Fourth Proportional to 1,393.41, 1,921.80 and 896.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.41 : 1,921.80 = 896.10 : x
2. Step 2: Convert to fraction form
   1,393.41/1,921.80 = 896.10/x
3. Step 3: Cross multiply
   1,393.41x = 1,921.80 × 896.10
4. Step 4: Simplify right side
   1,393.41x = 1,722,124.98
5. Step 5: Solve for x
   x = 1,722,124.98/1,393.41
6. Step 6: Final answer
   x = 1,235.91