Finding the Fourth Proportional to 42,643.46, 63,973.40 and 13,061.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,643.46 : 63,973.40 = 13,061.55 : x
2. Step 2: Convert to fraction form
   42,643.46/63,973.40 = 13,061.55/x
3. Step 3: Cross multiply
   42,643.46x = 63,973.40 × 13,061.55
4. Step 4: Simplify right side
   42,643.46x = 835,591,937.36
5. Step 5: Solve for x
   x = 835,591,937.36/42,643.46
6. Step 6: Final answer
   x = 19,594.84