Finding the Fourth Proportional to 1,399.72, 2,099.94 and 533.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.72 : 2,099.94 = 533.56 : x
2. Step 2: Convert to fraction form
   1,399.72/2,099.94 = 533.56/x
3. Step 3: Cross multiply
   1,399.72x = 2,099.94 × 533.56
4. Step 4: Simplify right side
   1,399.72x = 1,120,443.99
5. Step 5: Solve for x
   x = 1,120,443.99/1,399.72
6. Step 6: Final answer
   x = 800.48