Finding the Fourth Proportional to 1,124.41, 1,685.46 and 430.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.41 : 1,685.46 = 430.89 : x
2. Step 2: Convert to fraction form
   1,124.41/1,685.46 = 430.89/x
3. Step 3: Cross multiply
   1,124.41x = 1,685.46 × 430.89
4. Step 4: Simplify right side
   1,124.41x = 726,247.86
5. Step 5: Solve for x
   x = 726,247.86/1,124.41
6. Step 6: Final answer
   x = 645.89