Finding the Fourth Proportional to 1,404.01, 2,105.91 and 430.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.01 : 2,105.91 = 430.07 : x
2. Step 2: Convert to fraction form
   1,404.01/2,105.91 = 430.07/x
3. Step 3: Cross multiply
   1,404.01x = 2,105.91 × 430.07
4. Step 4: Simplify right side
   1,404.01x = 905,688.71
5. Step 5: Solve for x
   x = 905,688.71/1,404.01
6. Step 6: Final answer
   x = 645.08