Finding the Fourth Proportional to 83.21, 124.89 and 56.17

Step by Step Solution

1. Step 1: Write the proportion equation
   83.21 : 124.89 = 56.17 : x
2. Step 2: Convert to fraction form
   83.21/124.89 = 56.17/x
3. Step 3: Cross multiply
   83.21x = 124.89 × 56.17
4. Step 4: Simplify right side
   83.21x = 7,015.10
5. Step 5: Solve for x
   x = 7,015.10/83.21
6. Step 6: Final answer
   x = 84.31