Finding the Fourth Proportional to 1,339.50, 2,010.34 and 690.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.50 : 2,010.34 = 690.42 : x
2. Step 2: Convert to fraction form
   1,339.50/2,010.34 = 690.42/x
3. Step 3: Cross multiply
   1,339.50x = 2,010.34 × 690.42
4. Step 4: Simplify right side
   1,339.50x = 1,387,978.94
5. Step 5: Solve for x
   x = 1,387,978.94/1,339.50
6. Step 6: Final answer
   x = 1,036.19