Finding the Fourth Proportional to 1,307.61, 1,804.61 and 718.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.61 : 1,804.61 = 718.27 : x
2. Step 2: Convert to fraction form
   1,307.61/1,804.61 = 718.27/x
3. Step 3: Cross multiply
   1,307.61x = 1,804.61 × 718.27
4. Step 4: Simplify right side
   1,307.61x = 1,296,194.51
5. Step 5: Solve for x
   x = 1,296,194.51/1,307.61
6. Step 6: Final answer
   x = 991.27