Finding the Fourth Proportional to 22,916.25, 31,624.47 and 12,980.25

Step by Step Solution

1. Step 1: Write the proportion equation
   22,916.25 : 31,624.47 = 12,980.25 : x
2. Step 2: Convert to fraction form
   22,916.25/31,624.47 = 12,980.25/x
3. Step 3: Cross multiply
   22,916.25x = 31,624.47 × 12,980.25
4. Step 4: Simplify right side
   22,916.25x = 410,493,526.72
5. Step 5: Solve for x
   x = 410,493,526.72/22,916.25
6. Step 6: Final answer
   x = 17,912.77