Finding the Fourth Proportional to 1,404.47, 2,106.69 and 430.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.47 : 2,106.69 = 430.56 : x
2. Step 2: Convert to fraction form
   1,404.47/2,106.69 = 430.56/x
3. Step 3: Cross multiply
   1,404.47x = 2,106.69 × 430.56
4. Step 4: Simplify right side
   1,404.47x = 907,056.45
5. Step 5: Solve for x
   x = 907,056.45/1,404.47
6. Step 6: Final answer
   x = 645.84