Finding the Fourth Proportional to 1,379.52, 1,903.68 and 820.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.52 : 1,903.68 = 820.04 : x
2. Step 2: Convert to fraction form
   1,379.52/1,903.68 = 820.04/x
3. Step 3: Cross multiply
   1,379.52x = 1,903.68 × 820.04
4. Step 4: Simplify right side
   1,379.52x = 1,561,093.75
5. Step 5: Solve for x
   x = 1,561,093.75/1,379.52
6. Step 6: Final answer
   x = 1,131.62