Finding the Fourth Proportional to 117.72, 162.34 and 78.37

Step by Step Solution

1. Step 1: Write the proportion equation
   117.72 : 162.34 = 78.37 : x
2. Step 2: Convert to fraction form
   117.72/162.34 = 78.37/x
3. Step 3: Cross multiply
   117.72x = 162.34 × 78.37
4. Step 4: Simplify right side
   117.72x = 12,721.98
5. Step 5: Solve for x
   x = 12,721.98/117.72
6. Step 6: Final answer
   x = 108.07