Finding the Fourth Proportional to 13,300.51, 19,950.70 and 3,940.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,300.51 : 19,950.70 = 3,940.59 : x
2. Step 2: Convert to fraction form
   13,300.51/19,950.70 = 3,940.59/x
3. Step 3: Cross multiply
   13,300.51x = 19,950.70 × 3,940.59
4. Step 4: Simplify right side
   13,300.51x = 78,617,528.91
5. Step 5: Solve for x
   x = 78,617,528.91/13,300.51
6. Step 6: Final answer
   x = 5,910.87