Finding the Fourth Proportional to 13,114.61, 19,686.50 and 12,910.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,114.61 : 19,686.50 = 12,910.49 : x
2. Step 2: Convert to fraction form
   13,114.61/19,686.50 = 12,910.49/x
3. Step 3: Cross multiply
   13,114.61x = 19,686.50 × 12,910.49
4. Step 4: Simplify right side
   13,114.61x = 254,162,296.83
5. Step 5: Solve for x
   x = 254,162,296.83/13,114.61
6. Step 6: Final answer
   x = 19,380.09