Finding the Fourth Proportional to 72,419.20, 101,456 and 72,419.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,419.20 : 101,456 = 72,419.20 : x
2. Step 2: Convert to fraction form
   72,419.20/101,456 = 72,419.20/x
3. Step 3: Cross multiply
   72,419.20x = 101,456 × 72,419.20
4. Step 4: Simplify right side
   72,419.20x = 7,347,362,355.20
5. Step 5: Solve for x
   x = 7,347,362,355.20/72,419.20
6. Step 6: Final answer
   x = 101,456