Finding the Fourth Proportional to 1,379.98, 1,903.74 and 820.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.98 : 1,903.74 = 820.14 : x
2. Step 2: Convert to fraction form
   1,379.98/1,903.74 = 820.14/x
3. Step 3: Cross multiply
   1,379.98x = 1,903.74 × 820.14
4. Step 4: Simplify right side
   1,379.98x = 1,561,333.32
5. Step 5: Solve for x
   x = 1,561,333.32/1,379.98
6. Step 6: Final answer
   x = 1,131.42