Finding the Fourth Proportional to 108,191, 162,145.12 and 78,305.88

Step by Step Solution

1. Step 1: Write the proportion equation
   108,191 : 162,145.12 = 78,305.88 : x
2. Step 2: Convert to fraction form
   108,191/162,145.12 = 78,305.88/x
3. Step 3: Cross multiply
   108,191x = 162,145.12 × 78,305.88
4. Step 4: Simplify right side
   108,191x = 12,696,916,309.31
5. Step 5: Solve for x
   x = 12,696,916,309.31/108,191
6. Step 6: Final answer
   x = 117,356.49