Finding the Fourth Proportional to 107.02, 147.71 and 72.02

Step by Step Solution

1. Step 1: Write the proportion equation
   107.02 : 147.71 = 72.02 : x
2. Step 2: Convert to fraction form
   107.02/147.71 = 72.02/x
3. Step 3: Cross multiply
   107.02x = 147.71 × 72.02
4. Step 4: Simplify right side
   107.02x = 10,638.22
5. Step 5: Solve for x
   x = 10,638.22/107.02
6. Step 6: Final answer
   x = 99.40