Finding the Fourth Proportional to 22,181.60, 30,608.82 and 12,748.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,181.60 : 30,608.82 = 12,748.40 : x
2. Step 2: Convert to fraction form
   22,181.60/30,608.82 = 12,748.40/x
3. Step 3: Cross multiply
   22,181.60x = 30,608.82 × 12,748.40
4. Step 4: Simplify right side
   22,181.60x = 390,213,480.89
5. Step 5: Solve for x
   x = 390,213,480.89/22,181.60
6. Step 6: Final answer
   x = 17,591.76