Finding the Fourth Proportional to 1,403.34, 2,105.37 and 429.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.34 : 2,105.37 = 429.45 : x
2. Step 2: Convert to fraction form
   1,403.34/2,105.37 = 429.45/x
3. Step 3: Cross multiply
   1,403.34x = 2,105.37 × 429.45
4. Step 4: Simplify right side
   1,403.34x = 904,151.15
5. Step 5: Solve for x
   x = 904,151.15/1,403.34
6. Step 6: Final answer
   x = 644.29