Finding the Fourth Proportional to 1,309.83, 1,807.50 and 720.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.83 : 1,807.50 = 720.27 : x
2. Step 2: Convert to fraction form
   1,309.83/1,807.50 = 720.27/x
3. Step 3: Cross multiply
   1,309.83x = 1,807.50 × 720.27
4. Step 4: Simplify right side
   1,309.83x = 1,301,888.03
5. Step 5: Solve for x
   x = 1,301,888.03/1,309.83
6. Step 6: Final answer
   x = 993.94