Finding the Fourth Proportional to 1,387,106.10, 2,080,659.15 and 389,834.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387,106.10 : 2,080,659.15 = 389,834.10 : x
2. Step 2: Convert to fraction form
   1,387,106.10/2,080,659.15 = 389,834.10/x
3. Step 3: Cross multiply
   1,387,106.10x = 2,080,659.15 × 389,834.10
4. Step 4: Simplify right side
   1,387,106.10x = 811,111,887,147.02
5. Step 5: Solve for x
   x = 811,111,887,147.02/1,387,106.10
6. Step 6: Final answer
   x = 584,751.15