Finding the Fourth Proportional to 13,085.99, 18,056.91 and 7,778.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.99 : 18,056.91 = 7,778.87 : x
2. Step 2: Convert to fraction form
   13,085.99/18,056.91 = 7,778.87/x
3. Step 3: Cross multiply
   13,085.99x = 18,056.91 × 7,778.87
4. Step 4: Simplify right side
   13,085.99x = 140,462,226.31
5. Step 5: Solve for x
   x = 140,462,226.31/13,085.99
6. Step 6: Final answer
   x = 10,733.79