Finding the Fourth Proportional to 20,995.56, 28,972.62 and 12,498.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,995.56 : 28,972.62 = 12,498.30 : x
2. Step 2: Convert to fraction form
   20,995.56/28,972.62 = 12,498.30/x
3. Step 3: Cross multiply
   20,995.56x = 28,972.62 × 12,498.30
4. Step 4: Simplify right side
   20,995.56x = 362,108,496.55
5. Step 5: Solve for x
   x = 362,108,496.55/20,995.56
6. Step 6: Final answer
   x = 17,246.91