Finding the Fourth Proportional to 73,969.98, 102,078.60 and 39,978.36

Step by Step Solution

1. Step 1: Write the proportion equation
   73,969.98 : 102,078.60 = 39,978.36 : x
2. Step 2: Convert to fraction form
   73,969.98/102,078.60 = 39,978.36/x
3. Step 3: Cross multiply
   73,969.98x = 102,078.60 × 39,978.36
4. Step 4: Simplify right side
   73,969.98x = 4,080,935,019.10
5. Step 5: Solve for x
   x = 4,080,935,019.10/73,969.98
6. Step 6: Final answer
   x = 55,170.15