Finding the Fourth Proportional to 42,640.72, 63,961.23 and 13,058.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,640.72 : 63,961.23 = 13,058.42 : x
2. Step 2: Convert to fraction form
   42,640.72/63,961.23 = 13,058.42/x
3. Step 3: Cross multiply
   42,640.72x = 63,961.23 × 13,058.42
4. Step 4: Simplify right side
   42,640.72x = 835,232,539.76
5. Step 5: Solve for x
   x = 835,232,539.76/42,640.72
6. Step 6: Final answer
   x = 19,587.68