Finding the Fourth Proportional to 93.31, 128.72 and 62.22

Step by Step Solution

1. Step 1: Write the proportion equation
   93.31 : 128.72 = 62.22 : x
2. Step 2: Convert to fraction form
   93.31/128.72 = 62.22/x
3. Step 3: Cross multiply
   93.31x = 128.72 × 62.22
4. Step 4: Simplify right side
   93.31x = 8,008.96
5. Step 5: Solve for x
   x = 8,008.96/93.31
6. Step 6: Final answer
   x = 85.83