Finding the Fourth Proportional to 67.90, 101.72 and 57.82

Step by Step Solution

1. Step 1: Write the proportion equation
   67.90 : 101.72 = 57.82 : x
2. Step 2: Convert to fraction form
   67.90/101.72 = 57.82/x
3. Step 3: Cross multiply
   67.90x = 101.72 × 57.82
4. Step 4: Simplify right side
   67.90x = 5,881.45
5. Step 5: Solve for x
   x = 5,881.45/67.90
6. Step 6: Final answer
   x = 86.62