Finding the Fourth Proportional to 1,670.18, 2,305.59 and 998.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.18 : 2,305.59 = 998.22 : x
2. Step 2: Convert to fraction form
   1,670.18/2,305.59 = 998.22/x
3. Step 3: Cross multiply
   1,670.18x = 2,305.59 × 998.22
4. Step 4: Simplify right side
   1,670.18x = 2,301,486.05
5. Step 5: Solve for x
   x = 2,301,486.05/1,670.18
6. Step 6: Final answer
   x = 1,377.99