Finding the Fourth Proportional to 12,780.05, 17,637.57 and 7,114.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.05 : 17,637.57 = 7,114.61 : x
2. Step 2: Convert to fraction form
   12,780.05/17,637.57 = 7,114.61/x
3. Step 3: Cross multiply
   12,780.05x = 17,637.57 × 7,114.61
4. Step 4: Simplify right side
   12,780.05x = 125,484,431.90
5. Step 5: Solve for x
   x = 125,484,431.90/12,780.05
6. Step 6: Final answer
   x = 9,818.77