Finding the Fourth Proportional to 19,008.59, 28,517.52 and 13,397.20

Step by Step Solution

1. Step 1: Write the proportion equation
   19,008.59 : 28,517.52 = 13,397.20 : x
2. Step 2: Convert to fraction form
   19,008.59/28,517.52 = 13,397.20/x
3. Step 3: Cross multiply
   19,008.59x = 28,517.52 × 13,397.20
4. Step 4: Simplify right side
   19,008.59x = 382,054,897.89
5. Step 5: Solve for x
   x = 382,054,897.89/19,008.59
6. Step 6: Final answer
   x = 20,099.07