Finding the Fourth Proportional to 42,121.08, 63,180.72 and 12,539.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,121.08 : 63,180.72 = 12,539.34 : x
2. Step 2: Convert to fraction form
   42,121.08/63,180.72 = 12,539.34/x
3. Step 3: Cross multiply
   42,121.08x = 63,180.72 × 12,539.34
4. Step 4: Simplify right side
   42,121.08x = 792,244,529.52
5. Step 5: Solve for x
   x = 792,244,529.52/42,121.08
6. Step 6: Final answer
   x = 18,808.74