Finding the Fourth Proportional to 15,783.59, 21,780.61 and 9,064.48

Step by Step Solution

1. Step 1: Write the proportion equation
   15,783.59 : 21,780.61 = 9,064.48 : x
2. Step 2: Convert to fraction form
   15,783.59/21,780.61 = 9,064.48/x
3. Step 3: Cross multiply
   15,783.59x = 21,780.61 × 9,064.48
4. Step 4: Simplify right side
   15,783.59x = 197,429,826.62
5. Step 5: Solve for x
   x = 197,429,826.62/15,783.59
6. Step 6: Final answer
   x = 12,508.55