Finding the Fourth Proportional to 42,504.32, 63,754.32 and 12,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,504.32 : 63,754.32 = 12,921.50 : x
2. Step 2: Convert to fraction form
   42,504.32/63,754.32 = 12,921.50/x
3. Step 3: Cross multiply
   42,504.32x = 63,754.32 × 12,921.50
4. Step 4: Simplify right side
   42,504.32x = 823,801,445.88
5. Step 5: Solve for x
   x = 823,801,445.88/42,504.32
6. Step 6: Final answer
   x = 19,381.59