Finding the Fourth Proportional to 1,607.86, 2,218.83 and 899.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.86 : 2,218.83 = 899.73 : x
2. Step 2: Convert to fraction form
   1,607.86/2,218.83 = 899.73/x
3. Step 3: Cross multiply
   1,607.86x = 2,218.83 × 899.73
4. Step 4: Simplify right side
   1,607.86x = 1,996,347.92
5. Step 5: Solve for x
   x = 1,996,347.92/1,607.86
6. Step 6: Final answer
   x = 1,241.62