Finding the Fourth Proportional to 99.89, 149.88 and 69.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99.89 : 149.88 = 69.50 : x
2. Step 2: Convert to fraction form
   99.89/149.88 = 69.50/x
3. Step 3: Cross multiply
   99.89x = 149.88 × 69.50
4. Step 4: Simplify right side
   99.89x = 10,415.91
5. Step 5: Solve for x
   x = 10,415.91/99.89
6. Step 6: Final answer
   x = 104.28