Finding the Fourth Proportional to 199,144.72, 298,623 and 72,697.20

Step by Step Solution

1. Step 1: Write the proportion equation
   199,144.72 : 298,623 = 72,697.20 : x
2. Step 2: Convert to fraction form
   199,144.72/298,623 = 72,697.20/x
3. Step 3: Cross multiply
   199,144.72x = 298,623 × 72,697.20
4. Step 4: Simplify right side
   199,144.72x = 21,709,055,955.60
5. Step 5: Solve for x
   x = 21,709,055,955.60/199,144.72
6. Step 6: Final answer
   x = 109,011.46