Finding the Fourth Proportional to 13,300.70, 19,948.24 and 3,940.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,300.70 : 19,948.24 = 3,940.79 : x
2. Step 2: Convert to fraction form
   13,300.70/19,948.24 = 3,940.79/x
3. Step 3: Cross multiply
   13,300.70x = 19,948.24 × 3,940.79
4. Step 4: Simplify right side
   13,300.70x = 78,611,879.51
5. Step 5: Solve for x
   x = 78,611,879.51/13,300.70
6. Step 6: Final answer
   x = 5,910.36