Finding the Fourth Proportional to 1,308.34, 1,805.56 and 718.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.34 : 1,805.56 = 718.88 : x
2. Step 2: Convert to fraction form
   1,308.34/1,805.56 = 718.88/x
3. Step 3: Cross multiply
   1,308.34x = 1,805.56 × 718.88
4. Step 4: Simplify right side
   1,308.34x = 1,297,970.15
5. Step 5: Solve for x
   x = 1,297,970.15/1,308.34
6. Step 6: Final answer
   x = 992.08