Finding the Fourth Proportional to 99.89, 149.75 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99.89 : 149.75 = 42.06 : x
2. Step 2: Convert to fraction form
   99.89/149.75 = 42.06/x
3. Step 3: Cross multiply
   99.89x = 149.75 × 42.06
4. Step 4: Simplify right side
   99.89x = 6,298.27
5. Step 5: Solve for x
   x = 6,298.27/99.89
6. Step 6: Final answer
   x = 63.06