Finding the Fourth Proportional to 72,028.73, 108,028.16 and 21,428.03

Step by Step Solution

1. Step 1: Write the proportion equation
   72,028.73 : 108,028.16 = 21,428.03 : x
2. Step 2: Convert to fraction form
   72,028.73/108,028.16 = 21,428.03/x
3. Step 3: Cross multiply
   72,028.73x = 108,028.16 × 21,428.03
4. Step 4: Simplify right side
   72,028.73x = 2,314,830,006.04
5. Step 5: Solve for x
   x = 2,314,830,006.04/72,028.73
6. Step 6: Final answer
   x = 32,137.60