Finding the Fourth Proportional to 12,743.06, 19,117.84 and 3,978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,743.06 : 19,117.84 = 3,978.06 : x
2. Step 2: Convert to fraction form
   12,743.06/19,117.84 = 3,978.06/x
3. Step 3: Cross multiply
   12,743.06x = 19,117.84 × 3,978.06
4. Step 4: Simplify right side
   12,743.06x = 76,051,914.59
5. Step 5: Solve for x
   x = 76,051,914.59/12,743.06
6. Step 6: Final answer
   x = 5,968.10