Finding the Fourth Proportional to 10,707.80, 16,069.59 and 5,085.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,707.80 : 16,069.59 = 5,085.49 : x
2. Step 2: Convert to fraction form
   10,707.80/16,069.59 = 5,085.49/x
3. Step 3: Cross multiply
   10,707.80x = 16,069.59 × 5,085.49
4. Step 4: Simplify right side
   10,707.80x = 81,721,739.25
5. Step 5: Solve for x
   x = 81,721,739.25/10,707.80
6. Step 6: Final answer
   x = 7,631.98