Finding the Fourth Proportional to 99.45, 149.83 and 91.00

Step by Step Solution

1. Step 1: Write the proportion equation
   99.45 : 149.83 = 91.00 : x
2. Step 2: Convert to fraction form
   99.45/149.83 = 91.00/x
3. Step 3: Cross multiply
   99.45x = 149.83 × 91.00
4. Step 4: Simplify right side
   99.45x = 13,633.33
5. Step 5: Solve for x
   x = 13,633.33/99.45
6. Step 6: Final answer
   x = 137.09