Finding the Fourth Proportional to 13,307.32, 19,957.57 and 3,945.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,307.32 : 19,957.57 = 3,945.15 : x
2. Step 2: Convert to fraction form
   13,307.32/19,957.57 = 3,945.15/x
3. Step 3: Cross multiply
   13,307.32x = 19,957.57 × 3,945.15
4. Step 4: Simplify right side
   13,307.32x = 78,735,537.38
5. Step 5: Solve for x
   x = 78,735,537.38/13,307.32
6. Step 6: Final answer
   x = 5,916.71