Finding the Fourth Proportional to 102.51, 141.39 and 71.48

Step by Step Solution

1. Step 1: Write the proportion equation
   102.51 : 141.39 = 71.48 : x
2. Step 2: Convert to fraction form
   102.51/141.39 = 71.48/x
3. Step 3: Cross multiply
   102.51x = 141.39 × 71.48
4. Step 4: Simplify right side
   102.51x = 10,106.91
5. Step 5: Solve for x
   x = 10,106.91/102.51
6. Step 6: Final answer
   x = 98.59