Finding the Fourth Proportional to 1,397.89, 2,096.86 and 423.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.89 : 2,096.86 = 423.96 : x
2. Step 2: Convert to fraction form
   1,397.89/2,096.86 = 423.96/x
3. Step 3: Cross multiply
   1,397.89x = 2,096.86 × 423.96
4. Step 4: Simplify right side
   1,397.89x = 888,984.77
5. Step 5: Solve for x
   x = 888,984.77/1,397.89
6. Step 6: Final answer
   x = 635.95