Finding the Fourth Proportional to 1,388,275.98, 2,082,582.45 and 391,003.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,275.98 : 2,082,582.45 = 391,003.98 : x
2. Step 2: Convert to fraction form
   1,388,275.98/2,082,582.45 = 391,003.98/x
3. Step 3: Cross multiply
   1,388,275.98x = 2,082,582.45 × 391,003.98
4. Step 4: Simplify right side
   1,388,275.98x = 814,298,026,628.15
5. Step 5: Solve for x
   x = 814,298,026,628.15/1,388,275.98
6. Step 6: Final answer
   x = 586,553.42