Finding the Fourth Proportional to 1,106.27, 1,526.78 and 664.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.27 : 1,526.78 = 664.31 : x
2. Step 2: Convert to fraction form
   1,106.27/1,526.78 = 664.31/x
3. Step 3: Cross multiply
   1,106.27x = 1,526.78 × 664.31
4. Step 4: Simplify right side
   1,106.27x = 1,014,255.22
5. Step 5: Solve for x
   x = 1,014,255.22/1,106.27
6. Step 6: Final answer
   x = 916.82