Finding the Fourth Proportional to 990,483.15, 1,485,287.33 and 391,245.15

Step by Step Solution

1. Step 1: Write the proportion equation
   990,483.15 : 1,485,287.33 = 391,245.15 : x
2. Step 2: Convert to fraction form
   990,483.15/1,485,287.33 = 391,245.15/x
3. Step 3: Cross multiply
   990,483.15x = 1,485,287.33 × 391,245.15
4. Step 4: Simplify right side
   990,483.15x = 581,111,462,262.72
5. Step 5: Solve for x
   x = 581,111,462,262.72/990,483.15
6. Step 6: Final answer
   x = 586,694.95