Finding the Fourth Proportional to 12,900.86, 17,808.63 and 8,714.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.86 : 17,808.63 = 8,714.78 : x
2. Step 2: Convert to fraction form
   12,900.86/17,808.63 = 8,714.78/x
3. Step 3: Cross multiply
   12,900.86x = 17,808.63 × 8,714.78
4. Step 4: Simplify right side
   12,900.86x = 155,198,292.55
5. Step 5: Solve for x
   x = 155,198,292.55/12,900.86
6. Step 6: Final answer
   x = 12,030.07