Finding the Fourth Proportional to 1,307.09, 1,803.69 and 717.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.09 : 1,803.69 = 717.59 : x
2. Step 2: Convert to fraction form
   1,307.09/1,803.69 = 717.59/x
3. Step 3: Cross multiply
   1,307.09x = 1,803.69 × 717.59
4. Step 4: Simplify right side
   1,307.09x = 1,294,300.89
5. Step 5: Solve for x
   x = 1,294,300.89/1,307.09
6. Step 6: Final answer
   x = 990.22