Finding the Fourth Proportional to 13,200.15, 19,797.43 and 7,865.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.15 : 19,797.43 = 7,865.69 : x
2. Step 2: Convert to fraction form
   13,200.15/19,797.43 = 7,865.69/x
3. Step 3: Cross multiply
   13,200.15x = 19,797.43 × 7,865.69
4. Step 4: Simplify right side
   13,200.15x = 155,720,447.18
5. Step 5: Solve for x
   x = 155,720,447.18/13,200.15
6. Step 6: Final answer
   x = 11,796.87