Finding the Fourth Proportional to 12,804.96, 17,670.76 and 7,139.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,804.96 : 17,670.76 = 7,139.76 : x
2. Step 2: Convert to fraction form
   12,804.96/17,670.76 = 7,139.76/x
3. Step 3: Cross multiply
   12,804.96x = 17,670.76 × 7,139.76
4. Step 4: Simplify right side
   12,804.96x = 126,164,985.42
5. Step 5: Solve for x
   x = 126,164,985.42/12,804.96
6. Step 6: Final answer
   x = 9,852.82