Finding the Fourth Proportional to 72,272, 108,389.60 and 19,678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,272 : 108,389.60 = 19,678.72 : x
2. Step 2: Convert to fraction form
   72,272/108,389.60 = 19,678.72/x
3. Step 3: Cross multiply
   72,272x = 108,389.60 × 19,678.72
4. Step 4: Simplify right side
   72,272x = 2,132,968,589.31
5. Step 5: Solve for x
   x = 2,132,968,589.31/72,272
6. Step 6: Final answer
   x = 29,513.07