Finding the Fourth Proportional to 12,804.62, 17,670.27 and 7,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,804.62 : 17,670.27 = 7,139.30 : x
2. Step 2: Convert to fraction form
   12,804.62/17,670.27 = 7,139.30/x
3. Step 3: Cross multiply
   12,804.62x = 17,670.27 × 7,139.30
4. Step 4: Simplify right side
   12,804.62x = 126,153,358.61
5. Step 5: Solve for x
   x = 126,153,358.61/12,804.62
6. Step 6: Final answer
   x = 9,852.18