Finding the Fourth Proportional to 99.80, 149.76 and 67.31

Step by Step Solution

1. Step 1: Write the proportion equation
   99.80 : 149.76 = 67.31 : x
2. Step 2: Convert to fraction form
   99.80/149.76 = 67.31/x
3. Step 3: Cross multiply
   99.80x = 149.76 × 67.31
4. Step 4: Simplify right side
   99.80x = 10,080.72
5. Step 5: Solve for x
   x = 10,080.72/99.80
6. Step 6: Final answer
   x = 101.01