Finding the Fourth Proportional to 83.71, 124.88 and 81.10

Step by Step Solution

1. Step 1: Write the proportion equation
   83.71 : 124.88 = 81.10 : x
2. Step 2: Convert to fraction form
   83.71/124.88 = 81.10/x
3. Step 3: Cross multiply
   83.71x = 124.88 × 81.10
4. Step 4: Simplify right side
   83.71x = 10,127.77
5. Step 5: Solve for x
   x = 10,127.77/83.71
6. Step 6: Final answer
   x = 120.99