Finding the Fourth Proportional to 1,379.38, 1,903.94 and 820.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.38 : 1,903.94 = 820.24 : x
2. Step 2: Convert to fraction form
   1,379.38/1,903.94 = 820.24/x
3. Step 3: Cross multiply
   1,379.38x = 1,903.94 × 820.24
4. Step 4: Simplify right side
   1,379.38x = 1,561,688.10
5. Step 5: Solve for x
   x = 1,561,688.10/1,379.38
6. Step 6: Final answer
   x = 1,132.17