Finding the Fourth Proportional to 12,869.79, 19,401.12 and 12,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,869.79 : 19,401.12 = 12,012.50 : x
2. Step 2: Convert to fraction form
   12,869.79/19,401.12 = 12,012.50/x
3. Step 3: Cross multiply
   12,869.79x = 19,401.12 × 12,012.50
4. Step 4: Simplify right side
   12,869.79x = 233,056,002.50
5. Step 5: Solve for x
   x = 233,056,002.50/12,869.79
6. Step 6: Final answer
   x = 18,108.77