Finding the Fourth Proportional to 1,293.05, 1,785.83 and 899.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,293.05 : 1,785.83 = 899.39 : x
2. Step 2: Convert to fraction form
   1,293.05/1,785.83 = 899.39/x
3. Step 3: Cross multiply
   1,293.05x = 1,785.83 × 899.39
4. Step 4: Simplify right side
   1,293.05x = 1,606,144.22
5. Step 5: Solve for x
   x = 1,606,144.22/1,293.05
6. Step 6: Final answer
   x = 1,242.14