Finding the Fourth Proportional to 13,107.12, 18,085.72 and 7,801.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,107.12 : 18,085.72 = 7,801.76 : x
2. Step 2: Convert to fraction form
   13,107.12/18,085.72 = 7,801.76/x
3. Step 3: Cross multiply
   13,107.12x = 18,085.72 × 7,801.76
4. Step 4: Simplify right side
   13,107.12x = 141,100,446.87
5. Step 5: Solve for x
   x = 141,100,446.87/13,107.12
6. Step 6: Final answer
   x = 10,765.18