Finding the Fourth Proportional to 22,555.52, 31,128 and 12,619.52

Step by Step Solution

1. Step 1: Write the proportion equation
   22,555.52 : 31,128 = 12,619.52 : x
2. Step 2: Convert to fraction form
   22,555.52/31,128 = 12,619.52/x
3. Step 3: Cross multiply
   22,555.52x = 31,128 × 12,619.52
4. Step 4: Simplify right side
   22,555.52x = 392,820,418.56
5. Step 5: Solve for x
   x = 392,820,418.56/22,555.52
6. Step 6: Final answer
   x = 17,415.71