Finding the Fourth Proportional to 1,108.91, 1,530.30 and 666.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.91 : 1,530.30 = 666.82 : x
2. Step 2: Convert to fraction form
   1,108.91/1,530.30 = 666.82/x
3. Step 3: Cross multiply
   1,108.91x = 1,530.30 × 666.82
4. Step 4: Simplify right side
   1,108.91x = 1,020,430.82
5. Step 5: Solve for x
   x = 1,020,430.82/1,108.91
6. Step 6: Final answer
   x = 920.21