Finding the Fourth Proportional to 1,308.47, 1,805.59 and 718.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.47 : 1,805.59 = 718.91 : x
2. Step 2: Convert to fraction form
   1,308.47/1,805.59 = 718.91/x
3. Step 3: Cross multiply
   1,308.47x = 1,805.59 × 718.91
4. Step 4: Simplify right side
   1,308.47x = 1,298,056.71
5. Step 5: Solve for x
   x = 1,298,056.71/1,308.47
6. Step 6: Final answer
   x = 992.04