Finding the Fourth Proportional to 38,960.58, 58,454.76 and 12,665.40

Step by Step Solution

1. Step 1: Write the proportion equation
   38,960.58 : 58,454.76 = 12,665.40 : x
2. Step 2: Convert to fraction form
   38,960.58/58,454.76 = 12,665.40/x
3. Step 3: Cross multiply
   38,960.58x = 58,454.76 × 12,665.40
4. Step 4: Simplify right side
   38,960.58x = 740,352,917.30
5. Step 5: Solve for x
   x = 740,352,917.30/38,960.58
6. Step 6: Final answer
   x = 19,002.62