Finding the Fourth Proportional to 156.33, 215.71 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   156.33 : 215.71 = 90.82 : x
2. Step 2: Convert to fraction form
   156.33/215.71 = 90.82/x
3. Step 3: Cross multiply
   156.33x = 215.71 × 90.82
4. Step 4: Simplify right side
   156.33x = 19,590.78
5. Step 5: Solve for x
   x = 19,590.78/156.33
6. Step 6: Final answer
   x = 125.32