Finding the Fourth Proportional to 3,781.63, 5,665.29 and 2,139.36

Step by Step Solution

1. Step 1: Write the proportion equation
   3,781.63 : 5,665.29 = 2,139.36 : x
2. Step 2: Convert to fraction form
   3,781.63/5,665.29 = 2,139.36/x
3. Step 3: Cross multiply
   3,781.63x = 5,665.29 × 2,139.36
4. Step 4: Simplify right side
   3,781.63x = 12,120,094.81
5. Step 5: Solve for x
   x = 12,120,094.81/3,781.63
6. Step 6: Final answer
   x = 3,204.99