Finding the Fourth Proportional to 13,307.51, 19,957.85 and 3,945.33

Step by Step Solution

1. Step 1: Write the proportion equation
   13,307.51 : 19,957.85 = 3,945.33 : x
2. Step 2: Convert to fraction form
   13,307.51/19,957.85 = 3,945.33/x
3. Step 3: Cross multiply
   13,307.51x = 19,957.85 × 3,945.33
4. Step 4: Simplify right side
   13,307.51x = 78,740,389.05
5. Step 5: Solve for x
   x = 78,740,389.05/13,307.51
6. Step 6: Final answer
   x = 5,916.99