Finding the Fourth Proportional to 1,343.21, 1,854.53 and 839.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,343.21 : 1,854.53 = 839.27 : x
2. Step 2: Convert to fraction form
   1,343.21/1,854.53 = 839.27/x
3. Step 3: Cross multiply
   1,343.21x = 1,854.53 × 839.27
4. Step 4: Simplify right side
   1,343.21x = 1,556,437.92
5. Step 5: Solve for x
   x = 1,556,437.92/1,343.21
6. Step 6: Final answer
   x = 1,158.75