Finding the Fourth Proportional to 9,720.18, 14,580.72 and 3,146.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,720.18 : 14,580.72 = 3,146.88 : x
2. Step 2: Convert to fraction form
   9,720.18/14,580.72 = 3,146.88/x
3. Step 3: Cross multiply
   9,720.18x = 14,580.72 × 3,146.88
4. Step 4: Simplify right side
   9,720.18x = 45,883,776.15
5. Step 5: Solve for x
   x = 45,883,776.15/9,720.18
6. Step 6: Final answer
   x = 4,720.47