Finding the Fourth Proportional to 16,211.34, 22,370.31 and 9,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   16,211.34 : 22,370.31 = 9,139.50 : x
2. Step 2: Convert to fraction form
   16,211.34/22,370.31 = 9,139.50/x
3. Step 3: Cross multiply
   16,211.34x = 22,370.31 × 9,139.50
4. Step 4: Simplify right side
   16,211.34x = 204,453,448.25
5. Step 5: Solve for x
   x = 204,453,448.25/16,211.34
6. Step 6: Final answer
   x = 12,611.75