Finding the Fourth Proportional to 102.30, 141.32 and 71.30

Step by Step Solution

1. Step 1: Write the proportion equation
   102.30 : 141.32 = 71.30 : x
2. Step 2: Convert to fraction form
   102.30/141.32 = 71.30/x
3. Step 3: Cross multiply
   102.30x = 141.32 × 71.30
4. Step 4: Simplify right side
   102.30x = 10,076.12
5. Step 5: Solve for x
   x = 10,076.12/102.30
6. Step 6: Final answer
   x = 98.50