Finding the Fourth Proportional to 1,308.51, 1,805.67 and 718.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.51 : 1,805.67 = 718.98 : x
2. Step 2: Convert to fraction form
   1,308.51/1,805.67 = 718.98/x
3. Step 3: Cross multiply
   1,308.51x = 1,805.67 × 718.98
4. Step 4: Simplify right side
   1,308.51x = 1,298,240.62
5. Step 5: Solve for x
   x = 1,298,240.62/1,308.51
6. Step 6: Final answer
   x = 992.15