Finding the Fourth Proportional to 156.88, 235.33 and 42.88

Step by Step Solution

1. Step 1: Write the proportion equation
   156.88 : 235.33 = 42.88 : x
2. Step 2: Convert to fraction form
   156.88/235.33 = 42.88/x
3. Step 3: Cross multiply
   156.88x = 235.33 × 42.88
4. Step 4: Simplify right side
   156.88x = 10,089.67
5. Step 5: Solve for x
   x = 10,089.67/156.88
6. Step 6: Final answer
   x = 64.32