Finding the Fourth Proportional to 12,697.12, 17,526.73 and 7,661.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,697.12 : 17,526.73 = 7,661.55 : x
2. Step 2: Convert to fraction form
   12,697.12/17,526.73 = 7,661.55/x
3. Step 3: Cross multiply
   12,697.12x = 17,526.73 × 7,661.55
4. Step 4: Simplify right side
   12,697.12x = 134,281,899.08
5. Step 5: Solve for x
   x = 134,281,899.08/12,697.12
6. Step 6: Final answer
   x = 10,575.78