Finding the Fourth Proportional to 3,931.80, 5,889.78 and 1,820.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.80 : 5,889.78 = 1,820.45 : x
2. Step 2: Convert to fraction form
   3,931.80/5,889.78 = 1,820.45/x
3. Step 3: Cross multiply
   3,931.80x = 5,889.78 × 1,820.45
4. Step 4: Simplify right side
   3,931.80x = 10,722,050.00
5. Step 5: Solve for x
   x = 10,722,050.00/3,931.80
6. Step 6: Final answer
   x = 2,727.01