Finding the Fourth Proportional to 1,300.96, 1,951.55 and 423.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.96 : 1,951.55 = 423.15 : x
2. Step 2: Convert to fraction form
   1,300.96/1,951.55 = 423.15/x
3. Step 3: Cross multiply
   1,300.96x = 1,951.55 × 423.15
4. Step 4: Simplify right side
   1,300.96x = 825,790.54
5. Step 5: Solve for x
   x = 825,790.54/1,300.96
6. Step 6: Final answer
   x = 634.75