Finding the Fourth Proportional to 156.82, 216.39 and 89.52

Step by Step Solution

1. Step 1: Write the proportion equation
   156.82 : 216.39 = 89.52 : x
2. Step 2: Convert to fraction form
   156.82/216.39 = 89.52/x
3. Step 3: Cross multiply
   156.82x = 216.39 × 89.52
4. Step 4: Simplify right side
   156.82x = 19,370.61
5. Step 5: Solve for x
   x = 19,370.61/156.82
6. Step 6: Final answer
   x = 123.52