Finding the Fourth Proportional to 103,519.95, 155,233.72 and 72,131.68

Step by Step Solution

1. Step 1: Write the proportion equation
   103,519.95 : 155,233.72 = 72,131.68 : x
2. Step 2: Convert to fraction form
   103,519.95/155,233.72 = 72,131.68/x
3. Step 3: Cross multiply
   103,519.95x = 155,233.72 × 72,131.68
4. Step 4: Simplify right side
   103,519.95x = 11,197,269,016.25
5. Step 5: Solve for x
   x = 11,197,269,016.25/103,519.95
6. Step 6: Final answer
   x = 108,165.32