Finding the Fourth Proportional to 39,019.55, 58,538.63 and 12,724.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,019.55 : 58,538.63 = 12,724.31 : x
2. Step 2: Convert to fraction form
   39,019.55/58,538.63 = 12,724.31/x
3. Step 3: Cross multiply
   39,019.55x = 58,538.63 × 12,724.31
4. Step 4: Simplify right side
   39,019.55x = 744,863,853.25
5. Step 5: Solve for x
   x = 744,863,853.25/39,019.55
6. Step 6: Final answer
   x = 19,089.51