Finding the Fourth Proportional to 39,281.50, 58,931.46 and 12,986.06

Step by Step Solution

1. Step 1: Write the proportion equation
   39,281.50 : 58,931.46 = 12,986.06 : x
2. Step 2: Convert to fraction form
   39,281.50/58,931.46 = 12,986.06/x
3. Step 3: Cross multiply
   39,281.50x = 58,931.46 × 12,986.06
4. Step 4: Simplify right side
   39,281.50x = 765,287,622.78
5. Step 5: Solve for x
   x = 765,287,622.78/39,281.50
6. Step 6: Final answer
   x = 19,482.14