Finding the Fourth Proportional to 12,780.35, 17,641.69 and 7,476.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.35 : 17,641.69 = 7,476.87 : x
2. Step 2: Convert to fraction form
   12,780.35/17,641.69 = 7,476.87/x
3. Step 3: Cross multiply
   12,780.35x = 17,641.69 × 7,476.87
4. Step 4: Simplify right side
   12,780.35x = 131,904,604.02
5. Step 5: Solve for x
   x = 131,904,604.02/12,780.35
6. Step 6: Final answer
   x = 10,320.90