Finding the Fourth Proportional to 108,189, 162,142.12 and 78,303.86

Step by Step Solution

1. Step 1: Write the proportion equation
   108,189 : 162,142.12 = 78,303.86 : x
2. Step 2: Convert to fraction form
   108,189/162,142.12 = 78,303.86/x
3. Step 3: Cross multiply
   108,189x = 162,142.12 × 78,303.86
4. Step 4: Simplify right side
   108,189x = 12,696,353,864.58
5. Step 5: Solve for x
   x = 12,696,353,864.58/108,189
6. Step 6: Final answer
   x = 117,353.46