Finding the Fourth Proportional to 12,900.57, 17,796.22 and 8,426.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.57 : 17,796.22 = 8,426.94 : x
2. Step 2: Convert to fraction form
   12,900.57/17,796.22 = 8,426.94/x
3. Step 3: Cross multiply
   12,900.57x = 17,796.22 × 8,426.94
4. Step 4: Simplify right side
   12,900.57x = 149,967,637.77
5. Step 5: Solve for x
   x = 149,967,637.77/12,900.57
6. Step 6: Final answer
   x = 11,624.89