Finding the Fourth Proportional to 12,743.87, 19,114.86 and 3,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,743.87 : 19,114.86 = 3,978.50 : x
2. Step 2: Convert to fraction form
   12,743.87/19,114.86 = 3,978.50/x
3. Step 3: Cross multiply
   12,743.87x = 19,114.86 × 3,978.50
4. Step 4: Simplify right side
   12,743.87x = 76,048,470.51
5. Step 5: Solve for x
   x = 76,048,470.51/12,743.87
6. Step 6: Final answer
   x = 5,967.45