Finding the Fourth Proportional to 13,730.37, 18,947.59 and 7,761.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,730.37 : 18,947.59 = 7,761.78 : x
2. Step 2: Convert to fraction form
   13,730.37/18,947.59 = 7,761.78/x
3. Step 3: Cross multiply
   13,730.37x = 18,947.59 × 7,761.78
4. Step 4: Simplify right side
   13,730.37x = 147,067,005.71
5. Step 5: Solve for x
   x = 147,067,005.71/13,730.37
6. Step 6: Final answer
   x = 10,711.08