Finding the Fourth Proportional to 13,085.24, 18,051.28 and 7,776.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.24 : 18,051.28 = 7,776.30 : x
2. Step 2: Convert to fraction form
   13,085.24/18,051.28 = 7,776.30/x
3. Step 3: Cross multiply
   13,085.24x = 18,051.28 × 7,776.30
4. Step 4: Simplify right side
   13,085.24x = 140,372,168.66
5. Step 5: Solve for x
   x = 140,372,168.66/13,085.24
6. Step 6: Final answer
   x = 10,727.52