Finding the Fourth Proportional to 73,172.88, 100,978.56 and 39,638.88

Step by Step Solution

1. Step 1: Write the proportion equation
   73,172.88 : 100,978.56 = 39,638.88 : x
2. Step 2: Convert to fraction form
   73,172.88/100,978.56 = 39,638.88/x
3. Step 3: Cross multiply
   73,172.88x = 100,978.56 × 39,638.88
4. Step 4: Simplify right side
   73,172.88x = 4,002,677,022.41
5. Step 5: Solve for x
   x = 4,002,677,022.41/73,172.88
6. Step 6: Final answer
   x = 54,701.65