Finding the Fourth Proportional to 13,072.30, 18,041.31 and 7,767.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.30 : 18,041.31 = 7,767.13 : x
2. Step 2: Convert to fraction form
   13,072.30/18,041.31 = 7,767.13/x
3. Step 3: Cross multiply
   13,072.30x = 18,041.31 × 7,767.13
4. Step 4: Simplify right side
   13,072.30x = 140,129,200.14
5. Step 5: Solve for x
   x = 140,129,200.14/13,072.30
6. Step 6: Final answer
   x = 10,719.55