Finding the Fourth Proportional to 12,871.61, 17,853.72 and 12,530.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,871.61 : 17,853.72 = 12,530.19 : x
2. Step 2: Convert to fraction form
   12,871.61/17,853.72 = 12,530.19/x
3. Step 3: Cross multiply
   12,871.61x = 17,853.72 × 12,530.19
4. Step 4: Simplify right side
   12,871.61x = 223,710,523.77
5. Step 5: Solve for x
   x = 223,710,523.77/12,871.61
6. Step 6: Final answer
   x = 17,380.15