Finding the Fourth Proportional to 22,278.42, 30,742.86 and 12,719.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,278.42 : 30,742.86 = 12,719.40 : x
2. Step 2: Convert to fraction form
   22,278.42/30,742.86 = 12,719.40/x
3. Step 3: Cross multiply
   22,278.42x = 30,742.86 × 12,719.40
4. Step 4: Simplify right side
   22,278.42x = 391,030,733.48
5. Step 5: Solve for x
   x = 391,030,733.48/22,278.42
6. Step 6: Final answer
   x = 17,552.00