Finding the Fourth Proportional to 12,739.58, 17,581.72 and 7,436.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.58 : 17,581.72 = 7,436.10 : x
2. Step 2: Convert to fraction form
   12,739.58/17,581.72 = 7,436.10/x
3. Step 3: Cross multiply
   12,739.58x = 17,581.72 × 7,436.10
4. Step 4: Simplify right side
   12,739.58x = 130,739,428.09
5. Step 5: Solve for x
   x = 130,739,428.09/12,739.58
6. Step 6: Final answer
   x = 10,262.46