Finding the Fourth Proportional to 21,969.34, 30,319.86 and 12,539.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,969.34 : 30,319.86 = 12,539.32 : x
2. Step 2: Convert to fraction form
   21,969.34/30,319.86 = 12,539.32/x
3. Step 3: Cross multiply
   21,969.34x = 30,319.86 × 12,539.32
4. Step 4: Simplify right side
   21,969.34x = 380,190,426.90
5. Step 5: Solve for x
   x = 380,190,426.90/21,969.34
6. Step 6: Final answer
   x = 17,305.50