Finding the Fourth Proportional to 19,320.72, 28,893.59 and 19,080.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,320.72 : 28,893.59 = 19,080.15 : x
2. Step 2: Convert to fraction form
   19,320.72/28,893.59 = 19,080.15/x
3. Step 3: Cross multiply
   19,320.72x = 28,893.59 × 19,080.15
4. Step 4: Simplify right side
   19,320.72x = 551,294,031.24
5. Step 5: Solve for x
   x = 551,294,031.24/19,320.72
6. Step 6: Final answer
   x = 28,533.82