Finding the Fourth Proportional to 1,307.89, 1,804.98 and 718.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.89 : 1,804.98 = 718.43 : x
2. Step 2: Convert to fraction form
   1,307.89/1,804.98 = 718.43/x
3. Step 3: Cross multiply
   1,307.89x = 1,804.98 × 718.43
4. Step 4: Simplify right side
   1,307.89x = 1,296,758.55
5. Step 5: Solve for x
   x = 1,296,758.55/1,307.89
6. Step 6: Final answer
   x = 991.49