Finding the Fourth Proportional to 13,308.07, 19,958.69 and 3,945.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.07 : 19,958.69 = 3,945.90 : x
2. Step 2: Convert to fraction form
   13,308.07/19,958.69 = 3,945.90/x
3. Step 3: Cross multiply
   13,308.07x = 19,958.69 × 3,945.90
4. Step 4: Simplify right side
   13,308.07x = 78,755,004.74
5. Step 5: Solve for x
   x = 78,755,004.74/13,308.07
6. Step 6: Final answer
   x = 5,917.84