Finding the Fourth Proportional to 19,978.49, 29,982.72 and 7,510.79

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.49 : 29,982.72 = 7,510.79 : x
2. Step 2: Convert to fraction form
   19,978.49/29,982.72 = 7,510.79/x
3. Step 3: Cross multiply
   19,978.49x = 29,982.72 × 7,510.79
4. Step 4: Simplify right side
   19,978.49x = 225,193,913.55
5. Step 5: Solve for x
   x = 225,193,913.55/19,978.49
6. Step 6: Final answer
   x = 11,271.82