Finding the Fourth Proportional to 9,982.35, 14,978.79 and 7,640.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,982.35 : 14,978.79 = 7,640.91 : x
2. Step 2: Convert to fraction form
   9,982.35/14,978.79 = 7,640.91/x
3. Step 3: Cross multiply
   9,982.35x = 14,978.79 × 7,640.91
4. Step 4: Simplify right side
   9,982.35x = 114,451,586.30
5. Step 5: Solve for x
   x = 114,451,586.30/9,982.35
6. Step 6: Final answer
   x = 11,465.40