Finding the Fourth Proportional to 1,403.72, 2,104.56 and 429.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.72 : 2,104.56 = 429.29 : x
2. Step 2: Convert to fraction form
   1,403.72/2,104.56 = 429.29/x
3. Step 3: Cross multiply
   1,403.72x = 2,104.56 × 429.29
4. Step 4: Simplify right side
   1,403.72x = 903,456.04
5. Step 5: Solve for x
   x = 903,456.04/1,403.72
6. Step 6: Final answer
   x = 643.62