Finding the Fourth Proportional to 2,123.07, 3,182.42 and 891.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.07 : 3,182.42 = 891.20 : x
2. Step 2: Convert to fraction form
   2,123.07/3,182.42 = 891.20/x
3. Step 3: Cross multiply
   2,123.07x = 3,182.42 × 891.20
4. Step 4: Simplify right side
   2,123.07x = 2,836,152.34
5. Step 5: Solve for x
   x = 2,836,152.34/2,123.07
6. Step 6: Final answer
   x = 1,335.87