Finding the Fourth Proportional to 6,659.43, 9,987.42 and 1,978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   6,659.43 : 9,987.42 = 1,978.33 : x
2. Step 2: Convert to fraction form
   6,659.43/9,987.42 = 1,978.33/x
3. Step 3: Cross multiply
   6,659.43x = 9,987.42 × 1,978.33
4. Step 4: Simplify right side
   6,659.43x = 19,758,412.61
5. Step 5: Solve for x
   x = 19,758,412.61/6,659.43
6. Step 6: Final answer
   x = 2,966.98