Finding the Fourth Proportional to 14,265.80, 19,686.69 and 7,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   14,265.80 : 19,686.69 = 7,978.17 : x
2. Step 2: Convert to fraction form
   14,265.80/19,686.69 = 7,978.17/x
3. Step 3: Cross multiply
   14,265.80x = 19,686.69 × 7,978.17
4. Step 4: Simplify right side
   14,265.80x = 157,063,759.56
5. Step 5: Solve for x
   x = 157,063,759.56/14,265.80
6. Step 6: Final answer
   x = 11,009.81