Finding the Fourth Proportional to 13,730.78, 18,944.01 and 7,761.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,730.78 : 18,944.01 = 7,761.86 : x
2. Step 2: Convert to fraction form
   13,730.78/18,944.01 = 7,761.86/x
3. Step 3: Cross multiply
   13,730.78x = 18,944.01 × 7,761.86
4. Step 4: Simplify right side
   13,730.78x = 147,040,753.46
5. Step 5: Solve for x
   x = 147,040,753.46/13,730.78
6. Step 6: Final answer
   x = 10,708.84