Finding the Fourth Proportional to 102.30, 141.15 and 71.25

Step by Step Solution

1. Step 1: Write the proportion equation
   102.30 : 141.15 = 71.25 : x
2. Step 2: Convert to fraction form
   102.30/141.15 = 71.25/x
3. Step 3: Cross multiply
   102.30x = 141.15 × 71.25
4. Step 4: Simplify right side
   102.30x = 10,056.94
5. Step 5: Solve for x
   x = 10,056.94/102.30
6. Step 6: Final answer
   x = 98.31