Finding the Fourth Proportional to 12,969.92, 17,899.68 and 10,139.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,969.92 : 17,899.68 = 10,139.84 : x
2. Step 2: Convert to fraction form
   12,969.92/17,899.68 = 10,139.84/x
3. Step 3: Cross multiply
   12,969.92x = 17,899.68 × 10,139.84
4. Step 4: Simplify right side
   12,969.92x = 181,499,891.25
5. Step 5: Solve for x
   x = 181,499,891.25/12,969.92
6. Step 6: Final answer
   x = 13,993.91