Finding the Fourth Proportional to 10,380.66, 15,571.89 and 2,985.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.66 : 15,571.89 = 2,985.72 : x
2. Step 2: Convert to fraction form
   10,380.66/15,571.89 = 2,985.72/x
3. Step 3: Cross multiply
   10,380.66x = 15,571.89 × 2,985.72
4. Step 4: Simplify right side
   10,380.66x = 46,493,303.41
5. Step 5: Solve for x
   x = 46,493,303.41/10,380.66
6. Step 6: Final answer
   x = 4,478.84