Finding the Fourth Proportional to 10,557.97, 15,820.53 and 3,980.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,557.97 : 15,820.53 = 3,980.56 : x
2. Step 2: Convert to fraction form
   10,557.97/15,820.53 = 3,980.56/x
3. Step 3: Cross multiply
   10,557.97x = 15,820.53 × 3,980.56
4. Step 4: Simplify right side
   10,557.97x = 62,974,568.90
5. Step 5: Solve for x
   x = 62,974,568.90/10,557.97
6. Step 6: Final answer
   x = 5,964.65