Finding the Fourth Proportional to 106.56, 147.18 and 69.72

Step by Step Solution

1. Step 1: Write the proportion equation
   106.56 : 147.18 = 69.72 : x
2. Step 2: Convert to fraction form
   106.56/147.18 = 69.72/x
3. Step 3: Cross multiply
   106.56x = 147.18 × 69.72
4. Step 4: Simplify right side
   106.56x = 10,261.39
5. Step 5: Solve for x
   x = 10,261.39/106.56
6. Step 6: Final answer
   x = 96.30