Finding the Fourth Proportional to 22,257.60, 30,719.52 and 12,698.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,257.60 : 30,719.52 = 12,698.88 : x
2. Step 2: Convert to fraction form
   22,257.60/30,719.52 = 12,698.88/x
3. Step 3: Cross multiply
   22,257.60x = 30,719.52 × 12,698.88
4. Step 4: Simplify right side
   22,257.60x = 390,103,498.14
5. Step 5: Solve for x
   x = 390,103,498.14/22,257.60
6. Step 6: Final answer
   x = 17,526.75