Finding the Fourth Proportional to 100.56, 149.78 and 99.36

Step by Step Solution

1. Step 1: Write the proportion equation
   100.56 : 149.78 = 99.36 : x
2. Step 2: Convert to fraction form
   100.56/149.78 = 99.36/x
3. Step 3: Cross multiply
   100.56x = 149.78 × 99.36
4. Step 4: Simplify right side
   100.56x = 14,881.64
5. Step 5: Solve for x
   x = 14,881.64/100.56
6. Step 6: Final answer
   x = 147.99