Finding the Fourth Proportional to 13,266.16, 19,899.18 and 3,906.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,266.16 : 19,899.18 = 3,906.37 : x
2. Step 2: Convert to fraction form
   13,266.16/19,899.18 = 3,906.37/x
3. Step 3: Cross multiply
   13,266.16x = 19,899.18 × 3,906.37
4. Step 4: Simplify right side
   13,266.16x = 77,733,559.78
5. Step 5: Solve for x
   x = 77,733,559.78/13,266.16
6. Step 6: Final answer
   x = 5,859.54