Finding the Fourth Proportional to 1,111.40, 1,666.98 and 533.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.40 : 1,666.98 = 533.96 : x
2. Step 2: Convert to fraction form
   1,111.40/1,666.98 = 533.96/x
3. Step 3: Cross multiply
   1,111.40x = 1,666.98 × 533.96
4. Step 4: Simplify right side
   1,111.40x = 890,100.64
5. Step 5: Solve for x
   x = 890,100.64/1,111.40
6. Step 6: Final answer
   x = 800.88