Finding the Fourth Proportional to 42,643.46, 63,965.36 and 13,061.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,643.46 : 63,965.36 = 13,061.18 : x
2. Step 2: Convert to fraction form
   42,643.46/63,965.36 = 13,061.18/x
3. Step 3: Cross multiply
   42,643.46x = 63,965.36 × 13,061.18
4. Step 4: Simplify right side
   42,643.46x = 835,463,080.72
5. Step 5: Solve for x
   x = 835,463,080.72/42,643.46
6. Step 6: Final answer
   x = 19,591.82