Finding the Fourth Proportional to 81,280.72, 112,105.38 and 69,968.80

Step by Step Solution

1. Step 1: Write the proportion equation
   81,280.72 : 112,105.38 = 69,968.80 : x
2. Step 2: Convert to fraction form
   81,280.72/112,105.38 = 69,968.80/x
3. Step 3: Cross multiply
   81,280.72x = 112,105.38 × 69,968.80
4. Step 4: Simplify right side
   81,280.72x = 7,843,878,912.14
5. Step 5: Solve for x
   x = 7,843,878,912.14/81,280.72
6. Step 6: Final answer
   x = 96,503.56