Finding the Fourth Proportional to 67.42, 100.90 and 55.88

Step by Step Solution

1. Step 1: Write the proportion equation
   67.42 : 100.90 = 55.88 : x
2. Step 2: Convert to fraction form
   67.42/100.90 = 55.88/x
3. Step 3: Cross multiply
   67.42x = 100.90 × 55.88
4. Step 4: Simplify right side
   67.42x = 5,637.51
5. Step 5: Solve for x
   x = 5,637.51/67.42
6. Step 6: Final answer
   x = 83.62