Finding the Fourth Proportional to 1,307.58, 1,804.46 and 718.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.58 : 1,804.46 = 718.15 : x
2. Step 2: Convert to fraction form
   1,307.58/1,804.46 = 718.15/x
3. Step 3: Cross multiply
   1,307.58x = 1,804.46 × 718.15
4. Step 4: Simplify right side
   1,307.58x = 1,295,872.95
5. Step 5: Solve for x
   x = 1,295,872.95/1,307.58
6. Step 6: Final answer
   x = 991.05