Finding the Fourth Proportional to 83.34, 124.80 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   83.34 : 124.80 = 42.78 : x
2. Step 2: Convert to fraction form
   83.34/124.80 = 42.78/x
3. Step 3: Cross multiply
   83.34x = 124.80 × 42.78
4. Step 4: Simplify right side
   83.34x = 5,338.94
5. Step 5: Solve for x
   x = 5,338.94/83.34
6. Step 6: Final answer
   x = 64.06