Finding the Fourth Proportional to 11,904.21, 17,857.31 and 3,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,904.21 : 17,857.31 = 3,139.16 : x
2. Step 2: Convert to fraction form
   11,904.21/17,857.31 = 3,139.16/x
3. Step 3: Cross multiply
   11,904.21x = 17,857.31 × 3,139.16
4. Step 4: Simplify right side
   11,904.21x = 56,056,848.28
5. Step 5: Solve for x
   x = 56,056,848.28/11,904.21
6. Step 6: Final answer
   x = 4,708.99