Finding the Fourth Proportional to 12,899.37, 19,347.50 and 3,540.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.37 : 19,347.50 = 3,540.15 : x
2. Step 2: Convert to fraction form
   12,899.37/19,347.50 = 3,540.15/x
3. Step 3: Cross multiply
   12,899.37x = 19,347.50 × 3,540.15
4. Step 4: Simplify right side
   12,899.37x = 68,493,034.42
5. Step 5: Solve for x
   x = 68,493,034.42/12,899.37
6. Step 6: Final answer
   x = 5,309.80