Finding the Fourth Proportional to 12,686.51, 17,507.10 and 7,654.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.51 : 17,507.10 = 7,654.89 : x
2. Step 2: Convert to fraction form
   12,686.51/17,507.10 = 7,654.89/x
3. Step 3: Cross multiply
   12,686.51x = 17,507.10 × 7,654.89
4. Step 4: Simplify right side
   12,686.51x = 134,014,924.72
5. Step 5: Solve for x
   x = 134,014,924.72/12,686.51
6. Step 6: Final answer
   x = 10,563.58