Finding the Fourth Proportional to 1,335.69, 1,999.89 and 872.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.69 : 1,999.89 = 872.37 : x
2. Step 2: Convert to fraction form
   1,335.69/1,999.89 = 872.37/x
3. Step 3: Cross multiply
   1,335.69x = 1,999.89 × 872.37
4. Step 4: Simplify right side
   1,335.69x = 1,744,644.04
5. Step 5: Solve for x
   x = 1,744,644.04/1,335.69
6. Step 6: Final answer
   x = 1,306.17