Finding the Fourth Proportional to 12,761.72, 17,611.38 and 7,725.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,761.72 : 17,611.38 = 7,725.88 : x
2. Step 2: Convert to fraction form
   12,761.72/17,611.38 = 7,725.88/x
3. Step 3: Cross multiply
   12,761.72x = 17,611.38 × 7,725.88
4. Step 4: Simplify right side
   12,761.72x = 136,063,408.51
5. Step 5: Solve for x
   x = 136,063,408.51/12,761.72
6. Step 6: Final answer
   x = 10,661.84