Finding the Fourth Proportional to 9,978.56, 14,972.39 and 3,739.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.56 : 14,972.39 = 3,739.05 : x
2. Step 2: Convert to fraction form
   9,978.56/14,972.39 = 3,739.05/x
3. Step 3: Cross multiply
   9,978.56x = 14,972.39 × 3,739.05
4. Step 4: Simplify right side
   9,978.56x = 55,982,514.83
5. Step 5: Solve for x
   x = 55,982,514.83/9,978.56
6. Step 6: Final answer
   x = 5,610.28