Finding the Fourth Proportional to 81,673.25, 112,359.17 and 78,174.05

Step by Step Solution

1. Step 1: Write the proportion equation
   81,673.25 : 112,359.17 = 78,174.05 : x
2. Step 2: Convert to fraction form
   81,673.25/112,359.17 = 78,174.05/x
3. Step 3: Cross multiply
   81,673.25x = 112,359.17 × 78,174.05
4. Step 4: Simplify right side
   81,673.25x = 8,783,570,982.67
5. Step 5: Solve for x
   x = 8,783,570,982.67/81,673.25
6. Step 6: Final answer
   x = 107,545.26