Finding the Fourth Proportional to 42,505.49, 63,760.52 and 12,921.08

Step by Step Solution

1. Step 1: Write the proportion equation
   42,505.49 : 63,760.52 = 12,921.08 : x
2. Step 2: Convert to fraction form
   42,505.49/63,760.52 = 12,921.08/x
3. Step 3: Cross multiply
   42,505.49x = 63,760.52 × 12,921.08
4. Step 4: Simplify right side
   42,505.49x = 823,854,396.35
5. Step 5: Solve for x
   x = 823,854,396.35/42,505.49
6. Step 6: Final answer
   x = 19,382.31