Finding the Fourth Proportional to 1,106.56, 1,527.28 and 664.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.56 : 1,527.28 = 664.72 : x
2. Step 2: Convert to fraction form
   1,106.56/1,527.28 = 664.72/x
3. Step 3: Cross multiply
   1,106.56x = 1,527.28 × 664.72
4. Step 4: Simplify right side
   1,106.56x = 1,015,213.56
5. Step 5: Solve for x
   x = 1,015,213.56/1,106.56
6. Step 6: Final answer
   x = 917.45