Finding the Fourth Proportional to 1,308.02, 1,805.10 and 718.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.02 : 1,805.10 = 718.61 : x
2. Step 2: Convert to fraction form
   1,308.02/1,805.10 = 718.61/x
3. Step 3: Cross multiply
   1,308.02x = 1,805.10 × 718.61
4. Step 4: Simplify right side
   1,308.02x = 1,297,162.91
5. Step 5: Solve for x
   x = 1,297,162.91/1,308.02
6. Step 6: Final answer
   x = 991.70