Finding the Fourth Proportional to 1,042.05, 1,436.37 and 820.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.05 : 1,436.37 = 820.62 : x
2. Step 2: Convert to fraction form
   1,042.05/1,436.37 = 820.62/x
3. Step 3: Cross multiply
   1,042.05x = 1,436.37 × 820.62
4. Step 4: Simplify right side
   1,042.05x = 1,178,713.95
5. Step 5: Solve for x
   x = 1,178,713.95/1,042.05
6. Step 6: Final answer
   x = 1,131.15