Finding the Fourth Proportional to 22,471.63, 31,009.03 and 12,908.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,471.63 : 31,009.03 = 12,908.50 : x
2. Step 2: Convert to fraction form
   22,471.63/31,009.03 = 12,908.50/x
3. Step 3: Cross multiply
   22,471.63x = 31,009.03 × 12,908.50
4. Step 4: Simplify right side
   22,471.63x = 400,279,953.96
5. Step 5: Solve for x
   x = 400,279,953.96/22,471.63
6. Step 6: Final answer
   x = 17,812.68