Finding the Fourth Proportional to 1,490.91, 2,234.72 and 668.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.91 : 2,234.72 = 668.05 : x
2. Step 2: Convert to fraction form
   1,490.91/2,234.72 = 668.05/x
3. Step 3: Cross multiply
   1,490.91x = 2,234.72 × 668.05
4. Step 4: Simplify right side
   1,490.91x = 1,492,900.78
5. Step 5: Solve for x
   x = 1,492,900.78/1,490.91
6. Step 6: Final answer
   x = 1,001.34