Finding the Fourth Proportional to 13,307.69, 19,958.13 and 3,945.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,307.69 : 19,958.13 = 3,945.53 : x
2. Step 2: Convert to fraction form
   13,307.69/19,958.13 = 3,945.53/x
3. Step 3: Cross multiply
   13,307.69x = 19,958.13 × 3,945.53
4. Step 4: Simplify right side
   13,307.69x = 78,745,300.87
5. Step 5: Solve for x
   x = 78,745,300.87/13,307.69
6. Step 6: Final answer
   x = 5,917.28