Finding the Fourth Proportional to 12,817.86, 17,685.18 and 7,714.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,817.86 : 17,685.18 = 7,714.86 : x
2. Step 2: Convert to fraction form
   12,817.86/17,685.18 = 7,714.86/x
3. Step 3: Cross multiply
   12,817.86x = 17,685.18 × 7,714.86
4. Step 4: Simplify right side
   12,817.86x = 136,438,687.77
5. Step 5: Solve for x
   x = 136,438,687.77/12,817.86
6. Step 6: Final answer
   x = 10,644.42