Finding the Fourth Proportional to 19,978.12, 29,984.46 and 7,674.76

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.12 : 29,984.46 = 7,674.76 : x
2. Step 2: Convert to fraction form
   19,978.12/29,984.46 = 7,674.76/x
3. Step 3: Cross multiply
   19,978.12x = 29,984.46 × 7,674.76
4. Step 4: Simplify right side
   19,978.12x = 230,123,534.23
5. Step 5: Solve for x
   x = 230,123,534.23/19,978.12
6. Step 6: Final answer
   x = 11,518.78