Finding the Fourth Proportional to 1,404.24, 2,106.72 and 430.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.24 : 2,106.72 = 430.32 : x
2. Step 2: Convert to fraction form
   1,404.24/2,106.72 = 430.32/x
3. Step 3: Cross multiply
   1,404.24x = 2,106.72 × 430.32
4. Step 4: Simplify right side
   1,404.24x = 906,563.75
5. Step 5: Solve for x
   x = 906,563.75/1,404.24
6. Step 6: Final answer
   x = 645.59