Finding the Fourth Proportional to 71.21, 105.32 and 71.21

Step by Step Solution

1. Step 1: Write the proportion equation
   71.21 : 105.32 = 71.21 : x
2. Step 2: Convert to fraction form
   71.21/105.32 = 71.21/x
3. Step 3: Cross multiply
   71.21x = 105.32 × 71.21
4. Step 4: Simplify right side
   71.21x = 7,498.95
5. Step 5: Solve for x
   x = 7,498.95/71.21
6. Step 6: Final answer
   x = 105.32