Finding the Fourth Proportional to 1,106.88, 1,527.50 and 664.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.88 : 1,527.50 = 664.79 : x
2. Step 2: Convert to fraction form
   1,106.88/1,527.50 = 664.79/x
3. Step 3: Cross multiply
   1,106.88x = 1,527.50 × 664.79
4. Step 4: Simplify right side
   1,106.88x = 1,015,459.46
5. Step 5: Solve for x
   x = 1,015,459.46/1,106.88
6. Step 6: Final answer
   x = 917.41