Finding the Fourth Proportional to 78,386.31, 117,730.73 and 67,167

Step by Step Solution

1. Step 1: Write the proportion equation
   78,386.31 : 117,730.73 = 67,167 : x
2. Step 2: Convert to fraction form
   78,386.31/117,730.73 = 67,167/x
3. Step 3: Cross multiply
   78,386.31x = 117,730.73 × 67,167
4. Step 4: Simplify right side
   78,386.31x = 7,907,619,941.91
5. Step 5: Solve for x
   x = 7,907,619,941.91/78,386.31
6. Step 6: Final answer
   x = 100,880.11