Finding the Fourth Proportional to 42,508.56, 63,765.48 and 12,928.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,508.56 : 63,765.48 = 12,928.58 : x
2. Step 2: Convert to fraction form
   42,508.56/63,765.48 = 12,928.58/x
3. Step 3: Cross multiply
   42,508.56x = 63,765.48 × 12,928.58
4. Step 4: Simplify right side
   42,508.56x = 824,397,109.42
5. Step 5: Solve for x
   x = 824,397,109.42/42,508.56
6. Step 6: Final answer
   x = 19,393.67