Finding the Fourth Proportional to 13,112.82, 19,692.72 and 12,584.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,112.82 : 19,692.72 = 12,584.30 : x
2. Step 2: Convert to fraction form
   13,112.82/19,692.72 = 12,584.30/x
3. Step 3: Cross multiply
   13,112.82x = 19,692.72 × 12,584.30
4. Step 4: Simplify right side
   13,112.82x = 247,818,997.83
5. Step 5: Solve for x
   x = 247,818,997.83/13,112.82
6. Step 6: Final answer
   x = 18,898.99