Finding the Fourth Proportional to 12,783.35, 17,640.51 and 7,117.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.35 : 17,640.51 = 7,117.82 : x
2. Step 2: Convert to fraction form
   12,783.35/17,640.51 = 7,117.82/x
3. Step 3: Cross multiply
   12,783.35x = 17,640.51 × 7,117.82
4. Step 4: Simplify right side
   12,783.35x = 125,561,974.89
5. Step 5: Solve for x
   x = 125,561,974.89/12,783.35
6. Step 6: Final answer
   x = 9,822.31