Finding the Fourth Proportional to 12,964.12, 17,884.87 and 7,928.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,964.12 : 17,884.87 = 7,928.55 : x
2. Step 2: Convert to fraction form
   12,964.12/17,884.87 = 7,928.55/x
3. Step 3: Cross multiply
   12,964.12x = 17,884.87 × 7,928.55
4. Step 4: Simplify right side
   12,964.12x = 141,801,066.22
5. Step 5: Solve for x
   x = 141,801,066.22/12,964.12
6. Step 6: Final answer
   x = 10,937.97