Finding the Fourth Proportional to 15,783.72, 21,762.18 and 12,788.52

Step by Step Solution

1. Step 1: Write the proportion equation
   15,783.72 : 21,762.18 = 12,788.52 : x
2. Step 2: Convert to fraction form
   15,783.72/21,762.18 = 12,788.52/x
3. Step 3: Cross multiply
   15,783.72x = 21,762.18 × 12,788.52
4. Step 4: Simplify right side
   15,783.72x = 278,306,074.17
5. Step 5: Solve for x
   x = 278,306,074.17/15,783.72
6. Step 6: Final answer
   x = 17,632.48