Finding the Fourth Proportional to 22,068.72, 30,456 and 12,638.70

Step by Step Solution

1. Step 1: Write the proportion equation
   22,068.72 : 30,456 = 12,638.70 : x
2. Step 2: Convert to fraction form
   22,068.72/30,456 = 12,638.70/x
3. Step 3: Cross multiply
   22,068.72x = 30,456 × 12,638.70
4. Step 4: Simplify right side
   22,068.72x = 384,924,247.20
5. Step 5: Solve for x
   x = 384,924,247.20/22,068.72
6. Step 6: Final answer
   x = 17,442.07