Finding the Fourth Proportional to 1,607.98, 2,219.06 and 899.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.98 : 2,219.06 = 899.80 : x
2. Step 2: Convert to fraction form
   1,607.98/2,219.06 = 899.80/x
3. Step 3: Cross multiply
   1,607.98x = 2,219.06 × 899.80
4. Step 4: Simplify right side
   1,607.98x = 1,996,705.69
5. Step 5: Solve for x
   x = 1,996,705.69/1,607.98
6. Step 6: Final answer
   x = 1,241.75