Finding the Fourth Proportional to 13,315.89, 19,970.10 and 3,955.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,315.89 : 19,970.10 = 3,955.53 : x
2. Step 2: Convert to fraction form
   13,315.89/19,970.10 = 3,955.53/x
3. Step 3: Cross multiply
   13,315.89x = 19,970.10 × 3,955.53
4. Step 4: Simplify right side
   13,315.89x = 78,992,329.65
5. Step 5: Solve for x
   x = 78,992,329.65/13,315.89
6. Step 6: Final answer
   x = 5,932.19