Finding the Fourth Proportional to 13,072.56, 19,609.90 and 7,843.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,072.56 : 19,609.90 = 7,843.30 : x
2. Step 2: Convert to fraction form
   13,072.56/19,609.90 = 7,843.30/x
3. Step 3: Cross multiply
   13,072.56x = 19,609.90 × 7,843.30
4. Step 4: Simplify right side
   13,072.56x = 153,806,328.67
5. Step 5: Solve for x
   x = 153,806,328.67/13,072.56
6. Step 6: Final answer
   x = 11,765.59