Finding the Fourth Proportional to 1,015.53, 1,400.00 and 720.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.53 : 1,400.00 = 720.69 : x
2. Step 2: Convert to fraction form
   1,015.53/1,400.00 = 720.69/x
3. Step 3: Cross multiply
   1,015.53x = 1,400.00 × 720.69
4. Step 4: Simplify right side
   1,015.53x = 1,008,962.40
5. Step 5: Solve for x
   x = 1,008,962.40/1,015.53
6. Step 6: Final answer
   x = 993.53