Finding the Fourth Proportional to 82.71, 124.10 and 78.98

Step by Step Solution

1. Step 1: Write the proportion equation
   82.71 : 124.10 = 78.98 : x
2. Step 2: Convert to fraction form
   82.71/124.10 = 78.98/x
3. Step 3: Cross multiply
   82.71x = 124.10 × 78.98
4. Step 4: Simplify right side
   82.71x = 9,801.33
5. Step 5: Solve for x
   x = 9,801.33/82.71
6. Step 6: Final answer
   x = 118.50