Finding the Fourth Proportional to 13,268.72, 19,899.89 and 3,906.19

Step by Step Solution

1. Step 1: Write the proportion equation
   13,268.72 : 19,899.89 = 3,906.19 : x
2. Step 2: Convert to fraction form
   13,268.72/19,899.89 = 3,906.19/x
3. Step 3: Cross multiply
   13,268.72x = 19,899.89 × 3,906.19
4. Step 4: Simplify right side
   13,268.72x = 77,732,751.32
5. Step 5: Solve for x
   x = 77,732,751.32/13,268.72
6. Step 6: Final answer
   x = 5,858.35