Finding the Fourth Proportional to 83.70, 125.34 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   83.70 : 125.34 = 42.96 : x
2. Step 2: Convert to fraction form
   83.70/125.34 = 42.96/x
3. Step 3: Cross multiply
   83.70x = 125.34 × 42.96
4. Step 4: Simplify right side
   83.70x = 5,384.61
5. Step 5: Solve for x
   x = 5,384.61/83.70
6. Step 6: Final answer
   x = 64.33