Finding the Fourth Proportional to 1,404.32, 2,106.31 and 430.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.32 : 2,106.31 = 430.43 : x
2. Step 2: Convert to fraction form
   1,404.32/2,106.31 = 430.43/x
3. Step 3: Cross multiply
   1,404.32x = 2,106.31 × 430.43
4. Step 4: Simplify right side
   1,404.32x = 906,619.01
5. Step 5: Solve for x
   x = 906,619.01/1,404.32
6. Step 6: Final answer
   x = 645.59