Finding the Fourth Proportional to 42,643.40, 63,979.25 and 13,061.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,643.40 : 63,979.25 = 13,061.52 : x
2. Step 2: Convert to fraction form
   42,643.40/63,979.25 = 13,061.52/x
3. Step 3: Cross multiply
   42,643.40x = 63,979.25 × 13,061.52
4. Step 4: Simplify right side
   42,643.40x = 835,666,188.15
5. Step 5: Solve for x
   x = 835,666,188.15/42,643.40
6. Step 6: Final answer
   x = 19,596.61