Finding the Fourth Proportional to 12,783.76, 17,645.20 and 7,749.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.76 : 17,645.20 = 7,749.52 : x
2. Step 2: Convert to fraction form
   12,783.76/17,645.20 = 7,749.52/x
3. Step 3: Cross multiply
   12,783.76x = 17,645.20 × 7,749.52
4. Step 4: Simplify right side
   12,783.76x = 136,741,830.30
5. Step 5: Solve for x
   x = 136,741,830.30/12,783.76
6. Step 6: Final answer
   x = 10,696.53