Finding the Fourth Proportional to 13,013.96, 17,956.72 and 7,709.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,013.96 : 17,956.72 = 7,709.80 : x
2. Step 2: Convert to fraction form
   13,013.96/17,956.72 = 7,709.80/x
3. Step 3: Cross multiply
   13,013.96x = 17,956.72 × 7,709.80
4. Step 4: Simplify right side
   13,013.96x = 138,442,719.86
5. Step 5: Solve for x
   x = 138,442,719.86/13,013.96
6. Step 6: Final answer
   x = 10,638.02