Finding the Fourth Proportional to 12,623.71, 18,956.56 and 7,890.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,623.71 : 18,956.56 = 7,890.83 : x
2. Step 2: Convert to fraction form
   12,623.71/18,956.56 = 7,890.83/x
3. Step 3: Cross multiply
   12,623.71x = 18,956.56 × 7,890.83
4. Step 4: Simplify right side
   12,623.71x = 149,582,952.89
5. Step 5: Solve for x
   x = 149,582,952.89/12,623.71
6. Step 6: Final answer
   x = 11,849.37