Finding the Fourth Proportional to 9,789.78, 14,685.12 and 3,126.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,789.78 : 14,685.12 = 3,126.96 : x
2. Step 2: Convert to fraction form
   9,789.78/14,685.12 = 3,126.96/x
3. Step 3: Cross multiply
   9,789.78x = 14,685.12 × 3,126.96
4. Step 4: Simplify right side
   9,789.78x = 45,919,782.84
5. Step 5: Solve for x
   x = 45,919,782.84/9,789.78
6. Step 6: Final answer
   x = 4,690.58