Finding the Fourth Proportional to 78,168.57, 116,680.79 and 67,146.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78,168.57 : 116,680.79 = 67,146.09 : x
2. Step 2: Convert to fraction form
   78,168.57/116,680.79 = 67,146.09/x
3. Step 3: Cross multiply
   78,168.57x = 116,680.79 × 67,146.09
4. Step 4: Simplify right side
   78,168.57x = 7,834,658,901.60
5. Step 5: Solve for x
   x = 7,834,658,901.60/78,168.57
6. Step 6: Final answer
   x = 100,227.74