Finding the Fourth Proportional to 19,992.15, 30,006.72 and 10,138.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,992.15 : 30,006.72 = 10,138.50 : x
2. Step 2: Convert to fraction form
   19,992.15/30,006.72 = 10,138.50/x
3. Step 3: Cross multiply
   19,992.15x = 30,006.72 × 10,138.50
4. Step 4: Simplify right side
   19,992.15x = 304,223,130.72
5. Step 5: Solve for x
   x = 304,223,130.72/19,992.15
6. Step 6: Final answer
   x = 15,217.13