Finding the Fourth Proportional to 19,979.50, 29,970.69 and 7,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,979.50 : 29,970.69 = 7,667.50 : x
2. Step 2: Convert to fraction form
   19,979.50/29,970.69 = 7,667.50/x
3. Step 3: Cross multiply
   19,979.50x = 29,970.69 × 7,667.50
4. Step 4: Simplify right side
   19,979.50x = 229,800,265.58
5. Step 5: Solve for x
   x = 229,800,265.58/19,979.50
6. Step 6: Final answer
   x = 11,501.80