Finding the Fourth Proportional to 1,419.07, 2,128.67 and 494.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.07 : 2,128.67 = 494.72 : x
2. Step 2: Convert to fraction form
   1,419.07/2,128.67 = 494.72/x
3. Step 3: Cross multiply
   1,419.07x = 2,128.67 × 494.72
4. Step 4: Simplify right side
   1,419.07x = 1,053,093.15
5. Step 5: Solve for x
   x = 1,053,093.15/1,419.07
6. Step 6: Final answer
   x = 742.10