Finding the Fourth Proportional to 1,111.40, 1,665.82 and 534.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.40 : 1,665.82 = 534.12 : x
2. Step 2: Convert to fraction form
   1,111.40/1,665.82 = 534.12/x
3. Step 3: Cross multiply
   1,111.40x = 1,665.82 × 534.12
4. Step 4: Simplify right side
   1,111.40x = 889,747.78
5. Step 5: Solve for x
   x = 889,747.78/1,111.40
6. Step 6: Final answer
   x = 800.56