Finding the Fourth Proportional to 100.63, 150.83 and 42.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100.63 : 150.83 = 42.88 : x
2. Step 2: Convert to fraction form
   100.63/150.83 = 42.88/x
3. Step 3: Cross multiply
   100.63x = 150.83 × 42.88
4. Step 4: Simplify right side
   100.63x = 6,467.59
5. Step 5: Solve for x
   x = 6,467.59/100.63
6. Step 6: Final answer
   x = 64.27