Finding the Fourth Proportional to 3,180.47, 4,390.56 and 2,120.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,180.47 : 4,390.56 = 2,120.00 : x
2. Step 2: Convert to fraction form
   3,180.47/4,390.56 = 2,120.00/x
3. Step 3: Cross multiply
   3,180.47x = 4,390.56 × 2,120.00
4. Step 4: Simplify right side
   3,180.47x = 9,307,965.25
5. Step 5: Solve for x
   x = 9,307,965.25/3,180.47
6. Step 6: Final answer
   x = 2,926.61