Finding the Fourth Proportional to 1,607.99, 2,219.00 and 899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.99 : 2,219.00 = 899.78 : x
2. Step 2: Convert to fraction form
   1,607.99/2,219.00 = 899.78/x
3. Step 3: Cross multiply
   1,607.99x = 2,219.00 × 899.78
4. Step 4: Simplify right side
   1,607.99x = 1,996,596.23
5. Step 5: Solve for x
   x = 1,996,596.23/1,607.99
6. Step 6: Final answer
   x = 1,241.68