Finding the Fourth Proportional to 100.00, 149.86 and 90.01

Step by Step Solution

1. Step 1: Write the proportion equation
   100.00 : 149.86 = 90.01 : x
2. Step 2: Convert to fraction form
   100.00/149.86 = 90.01/x
3. Step 3: Cross multiply
   100.00x = 149.86 × 90.01
4. Step 4: Simplify right side
   100.00x = 13,487.70
5. Step 5: Solve for x
   x = 13,487.70/100.00
6. Step 6: Final answer
   x = 134.88