Finding the Fourth Proportional to 1,207.69, 1,810.72 and 558.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.69 : 1,810.72 = 558.07 : x
2. Step 2: Convert to fraction form
   1,207.69/1,810.72 = 558.07/x
3. Step 3: Cross multiply
   1,207.69x = 1,810.72 × 558.07
4. Step 4: Simplify right side
   1,207.69x = 1,010,504.68
5. Step 5: Solve for x
   x = 1,010,504.68/1,207.69
6. Step 6: Final answer
   x = 836.73