Finding the Fourth Proportional to 2,351.78, 3,528.46 and 891.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,351.78 : 3,528.46 = 891.34 : x
2. Step 2: Convert to fraction form
   2,351.78/3,528.46 = 891.34/x
3. Step 3: Cross multiply
   2,351.78x = 3,528.46 × 891.34
4. Step 4: Simplify right side
   2,351.78x = 3,145,057.54
5. Step 5: Solve for x
   x = 3,145,057.54/2,351.78
6. Step 6: Final answer
   x = 1,337.31