Finding the Fourth Proportional to 100.63, 150.99 and 68.50

Step by Step Solution

1. Step 1: Write the proportion equation
   100.63 : 150.99 = 68.50 : x
2. Step 2: Convert to fraction form
   100.63/150.99 = 68.50/x
3. Step 3: Cross multiply
   100.63x = 150.99 × 68.50
4. Step 4: Simplify right side
   100.63x = 10,342.82
5. Step 5: Solve for x
   x = 10,342.82/100.63
6. Step 6: Final answer
   x = 102.78