Finding the Fourth Proportional to 99.94, 149.77 and 89.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99.94 : 149.77 = 89.10 : x
2. Step 2: Convert to fraction form
   99.94/149.77 = 89.10/x
3. Step 3: Cross multiply
   99.94x = 149.77 × 89.10
4. Step 4: Simplify right side
   99.94x = 13,344.51
5. Step 5: Solve for x
   x = 13,344.51/99.94
6. Step 6: Final answer
   x = 133.53