Finding the Fourth Proportional to 1,387,682.10, 2,081,523.15 and 390,410.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,682.10 : 2,081,523.15 = 390,410.10 : x
2. Step 2: Convert to fraction form
   1,387,682.10/2,081,523.15 = 390,410.10/x
3. Step 3: Cross multiply
   1,387,682.10x = 2,081,523.15 × 390,410.10
4. Step 4: Simplify right side
   1,387,682.10x = 812,647,661,143.82
5. Step 5: Solve for x
   x = 812,647,661,143.82/1,387,682.10
6. Step 6: Final answer
   x = 585,615.15