Finding the Fourth Proportional to 1,307.50, 1,804.35 and 718.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.50 : 1,804.35 = 718.05 : x
2. Step 2: Convert to fraction form
   1,307.50/1,804.35 = 718.05/x
3. Step 3: Cross multiply
   1,307.50x = 1,804.35 × 718.05
4. Step 4: Simplify right side
   1,307.50x = 1,295,613.52
5. Step 5: Solve for x
   x = 1,295,613.52/1,307.50
6. Step 6: Final answer
   x = 990.91