Finding the Fourth Proportional to 143.56, 214.89 and 100.10

Step by Step Solution

1. Step 1: Write the proportion equation
   143.56 : 214.89 = 100.10 : x
2. Step 2: Convert to fraction form
   143.56/214.89 = 100.10/x
3. Step 3: Cross multiply
   143.56x = 214.89 × 100.10
4. Step 4: Simplify right side
   143.56x = 21,510.49
5. Step 5: Solve for x
   x = 21,510.49/143.56
6. Step 6: Final answer
   x = 149.84