Finding the Fourth Proportional to 73,172.56, 100,978.32 and 39,638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   73,172.56 : 100,978.32 = 39,638.56 : x
2. Step 2: Convert to fraction form
   73,172.56/100,978.32 = 39,638.56/x
3. Step 3: Cross multiply
   73,172.56x = 100,978.32 × 39,638.56
4. Step 4: Simplify right side
   73,172.56x = 4,002,635,196.02
5. Step 5: Solve for x
   x = 4,002,635,196.02/73,172.56
6. Step 6: Final answer
   x = 54,701.31