Finding the Fourth Proportional to 1,309.82, 1,807.52 and 720.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.82 : 1,807.52 = 720.36 : x
2. Step 2: Convert to fraction form
   1,309.82/1,807.52 = 720.36/x
3. Step 3: Cross multiply
   1,309.82x = 1,807.52 × 720.36
4. Step 4: Simplify right side
   1,309.82x = 1,302,061.51
5. Step 5: Solve for x
   x = 1,302,061.51/1,309.82
6. Step 6: Final answer
   x = 994.08