Finding the Fourth Proportional to 93.24, 139.86 and 78.12

Step by Step Solution

1. Step 1: Write the proportion equation
   93.24 : 139.86 = 78.12 : x
2. Step 2: Convert to fraction form
   93.24/139.86 = 78.12/x
3. Step 3: Cross multiply
   93.24x = 139.86 × 78.12
4. Step 4: Simplify right side
   93.24x = 10,925.86
5. Step 5: Solve for x
   x = 10,925.86/93.24
6. Step 6: Final answer
   x = 117.18