Finding the Fourth Proportional to 42,200.45, 63,308.88 and 12,617.63

Step by Step Solution

1. Step 1: Write the proportion equation
   42,200.45 : 63,308.88 = 12,617.63 : x
2. Step 2: Convert to fraction form
   42,200.45/63,308.88 = 12,617.63/x
3. Step 3: Cross multiply
   42,200.45x = 63,308.88 × 12,617.63
4. Step 4: Simplify right side
   42,200.45x = 798,808,023.55
5. Step 5: Solve for x
   x = 798,808,023.55/42,200.45
6. Step 6: Final answer
   x = 18,928.90