Finding the Fourth Proportional to 1,404.48, 2,107.16 and 430.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.48 : 2,107.16 = 430.72 : x
2. Step 2: Convert to fraction form
   1,404.48/2,107.16 = 430.72/x
3. Step 3: Cross multiply
   1,404.48x = 2,107.16 × 430.72
4. Step 4: Simplify right side
   1,404.48x = 907,595.96
5. Step 5: Solve for x
   x = 907,595.96/1,404.48
6. Step 6: Final answer
   x = 646.21