Finding the Fourth Proportional to 1,273.59, 1,755.68 and 899.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,273.59 : 1,755.68 = 899.42 : x
2. Step 2: Convert to fraction form
   1,273.59/1,755.68 = 899.42/x
3. Step 3: Cross multiply
   1,273.59x = 1,755.68 × 899.42
4. Step 4: Simplify right side
   1,273.59x = 1,579,080.43
5. Step 5: Solve for x
   x = 1,579,080.43/1,273.59
6. Step 6: Final answer
   x = 1,239.87