Finding the Fourth Proportional to 12,900.61, 19,350.94 and 3,540.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.61 : 19,350.94 = 3,540.76 : x
2. Step 2: Convert to fraction form
   12,900.61/19,350.94 = 3,540.76/x
3. Step 3: Cross multiply
   12,900.61x = 19,350.94 × 3,540.76
4. Step 4: Simplify right side
   12,900.61x = 68,516,919.86
5. Step 5: Solve for x
   x = 68,516,919.86/12,900.61
6. Step 6: Final answer
   x = 5,311.14