Finding the Fourth Proportional to 9,720.63, 14,579.33 and 3,145.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720.63 : 14,579.33 = 3,145.86 : x
2. Step 2: Convert to fraction form
   9,720.63/14,579.33 = 3,145.86/x
3. Step 3: Cross multiply
   9,720.63x = 14,579.33 × 3,145.86
4. Step 4: Simplify right side
   9,720.63x = 45,864,515.34
5. Step 5: Solve for x
   x = 45,864,515.34/9,720.63
6. Step 6: Final answer
   x = 4,718.27