Finding the Fourth Proportional to 1,108.42, 1,529.72 and 666.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.42 : 1,529.72 = 666.25 : x
2. Step 2: Convert to fraction form
   1,108.42/1,529.72 = 666.25/x
3. Step 3: Cross multiply
   1,108.42x = 1,529.72 × 666.25
4. Step 4: Simplify right side
   1,108.42x = 1,019,175.95
5. Step 5: Solve for x
   x = 1,019,175.95/1,108.42
6. Step 6: Final answer
   x = 919.49