Finding the Fourth Proportional to 11,904.65, 17,857.85 and 3,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,904.65 : 17,857.85 = 3,139.50 : x
2. Step 2: Convert to fraction form
   11,904.65/17,857.85 = 3,139.50/x
3. Step 3: Cross multiply
   11,904.65x = 17,857.85 × 3,139.50
4. Step 4: Simplify right side
   11,904.65x = 56,064,704.38
5. Step 5: Solve for x
   x = 56,064,704.38/11,904.65
6. Step 6: Final answer
   x = 4,709.48