Finding the Fourth Proportional to 9,978.49, 14,945.07 and 7,739.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.49 : 14,945.07 = 7,739.35 : x
2. Step 2: Convert to fraction form
   9,978.49/14,945.07 = 7,739.35/x
3. Step 3: Cross multiply
   9,978.49x = 14,945.07 × 7,739.35
4. Step 4: Simplify right side
   9,978.49x = 115,665,052.78
5. Step 5: Solve for x
   x = 115,665,052.78/9,978.49
6. Step 6: Final answer
   x = 11,591.44