Finding the Fourth Proportional to 191.31, 287.06 and 83.10

Step by Step Solution

1. Step 1: Write the proportion equation
   191.31 : 287.06 = 83.10 : x
2. Step 2: Convert to fraction form
   191.31/287.06 = 83.10/x
3. Step 3: Cross multiply
   191.31x = 287.06 × 83.10
4. Step 4: Simplify right side
   191.31x = 23,854.69
5. Step 5: Solve for x
   x = 23,854.69/191.31
6. Step 6: Final answer
   x = 124.69