Finding the Fourth Proportional to 1,398.72, 2,097.72 and 533.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.72 : 2,097.72 = 533.28 : x
2. Step 2: Convert to fraction form
   1,398.72/2,097.72 = 533.28/x
3. Step 3: Cross multiply
   1,398.72x = 2,097.72 × 533.28
4. Step 4: Simplify right side
   1,398.72x = 1,118,672.12
5. Step 5: Solve for x
   x = 1,118,672.12/1,398.72
6. Step 6: Final answer
   x = 799.78