Finding the Fourth Proportional to 83.50, 125.10 and 42.91

Step by Step Solution

1. Step 1: Write the proportion equation
   83.50 : 125.10 = 42.91 : x
2. Step 2: Convert to fraction form
   83.50/125.10 = 42.91/x
3. Step 3: Cross multiply
   83.50x = 125.10 × 42.91
4. Step 4: Simplify right side
   83.50x = 5,368.04
5. Step 5: Solve for x
   x = 5,368.04/83.50
6. Step 6: Final answer
   x = 64.29