Finding the Fourth Proportional to 156.72, 216.06 and 101.42

Step by Step Solution

1. Step 1: Write the proportion equation
   156.72 : 216.06 = 101.42 : x
2. Step 2: Convert to fraction form
   156.72/216.06 = 101.42/x
3. Step 3: Cross multiply
   156.72x = 216.06 × 101.42
4. Step 4: Simplify right side
   156.72x = 21,912.81
5. Step 5: Solve for x
   x = 21,912.81/156.72
6. Step 6: Final answer
   x = 139.82