Finding the Fourth Proportional to 42,196.96, 63,293.28 and 12,615.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,196.96 : 63,293.28 = 12,615.04 : x
2. Step 2: Convert to fraction form
   42,196.96/63,293.28 = 12,615.04/x
3. Step 3: Cross multiply
   42,196.96x = 63,293.28 × 12,615.04
4. Step 4: Simplify right side
   42,196.96x = 798,447,258.93
5. Step 5: Solve for x
   x = 798,447,258.93/42,196.96
6. Step 6: Final answer
   x = 18,921.91