Finding the Fourth Proportional to 78,385.31, 117,729.23 and 67,166.00

Step by Step Solution

1. Step 1: Write the proportion equation
   78,385.31 : 117,729.23 = 67,166.00 : x
2. Step 2: Convert to fraction form
   78,385.31/117,729.23 = 67,166.00/x
3. Step 3: Cross multiply
   78,385.31x = 117,729.23 × 67,166.00
4. Step 4: Simplify right side
   78,385.31x = 7,907,400,537.70
5. Step 5: Solve for x
   x = 7,907,400,537.70/78,385.31
6. Step 6: Final answer
   x = 100,878.61