Finding the Fourth Proportional to 12,818.10, 17,690.62 and 7,784.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.10 : 17,690.62 = 7,784.34 : x
2. Step 2: Convert to fraction form
   12,818.10/17,690.62 = 7,784.34/x
3. Step 3: Cross multiply
   12,818.10x = 17,690.62 × 7,784.34
4. Step 4: Simplify right side
   12,818.10x = 137,709,800.89
5. Step 5: Solve for x
   x = 137,709,800.89/12,818.10
6. Step 6: Final answer
   x = 10,743.39