Finding the Fourth Proportional to 83.30, 124.86 and 42.63

Step by Step Solution

1. Step 1: Write the proportion equation
   83.30 : 124.86 = 42.63 : x
2. Step 2: Convert to fraction form
   83.30/124.86 = 42.63/x
3. Step 3: Cross multiply
   83.30x = 124.86 × 42.63
4. Step 4: Simplify right side
   83.30x = 5,322.57
5. Step 5: Solve for x
   x = 5,322.57/83.30
6. Step 6: Final answer
   x = 63.90