Finding the Fourth Proportional to 1,111.42, 1,666.20 and 699.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.42 : 1,666.20 = 699.54 : x
2. Step 2: Convert to fraction form
   1,111.42/1,666.20 = 699.54/x
3. Step 3: Cross multiply
   1,111.42x = 1,666.20 × 699.54
4. Step 4: Simplify right side
   1,111.42x = 1,165,573.55
5. Step 5: Solve for x
   x = 1,165,573.55/1,111.42
6. Step 6: Final answer
   x = 1,048.72