Finding the Fourth Proportional to 12,504.87, 17,243.55 and 7,780.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,504.87 : 17,243.55 = 7,780.95 : x
2. Step 2: Convert to fraction form
   12,504.87/17,243.55 = 7,780.95/x
3. Step 3: Cross multiply
   12,504.87x = 17,243.55 × 7,780.95
4. Step 4: Simplify right side
   12,504.87x = 134,171,200.37
5. Step 5: Solve for x
   x = 134,171,200.37/12,504.87
6. Step 6: Final answer
   x = 10,729.52