Finding the Fourth Proportional to 3,690.90, 5,536.71 and 1,936.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,690.90 : 5,536.71 = 1,936.80 : x
2. Step 2: Convert to fraction form
   3,690.90/5,536.71 = 1,936.80/x
3. Step 3: Cross multiply
   3,690.90x = 5,536.71 × 1,936.80
4. Step 4: Simplify right side
   3,690.90x = 10,723,499.93
5. Step 5: Solve for x
   x = 10,723,499.93/3,690.90
6. Step 6: Final answer
   x = 2,905.39