Finding the Fourth Proportional to 86.02, 128.90 and 37.82

Step by Step Solution

1. Step 1: Write the proportion equation
   86.02 : 128.90 = 37.82 : x
2. Step 2: Convert to fraction form
   86.02/128.90 = 37.82/x
3. Step 3: Cross multiply
   86.02x = 128.90 × 37.82
4. Step 4: Simplify right side
   86.02x = 4,875.00
5. Step 5: Solve for x
   x = 4,875.00/86.02
6. Step 6: Final answer
   x = 56.68