Finding the Fourth Proportional to 42,272.89, 63,390.65 and 12,685.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,272.89 : 63,390.65 = 12,685.06 : x
2. Step 2: Convert to fraction form
   42,272.89/63,390.65 = 12,685.06/x
3. Step 3: Cross multiply
   42,272.89x = 63,390.65 × 12,685.06
4. Step 4: Simplify right side
   42,272.89x = 804,113,929.28
5. Step 5: Solve for x
   x = 804,113,929.28/42,272.89
6. Step 6: Final answer
   x = 19,021.98