Finding the Fourth Proportional to 112.86, 155.72 and 71.34

Step by Step Solution

1. Step 1: Write the proportion equation
   112.86 : 155.72 = 71.34 : x
2. Step 2: Convert to fraction form
   112.86/155.72 = 71.34/x
3. Step 3: Cross multiply
   112.86x = 155.72 × 71.34
4. Step 4: Simplify right side
   112.86x = 11,109.06
5. Step 5: Solve for x
   x = 11,109.06/112.86
6. Step 6: Final answer
   x = 98.43