Finding the Fourth Proportional to 2,451.18, 3,678.59 and 990.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.18 : 3,678.59 = 990.34 : x
2. Step 2: Convert to fraction form
   2,451.18/3,678.59 = 990.34/x
3. Step 3: Cross multiply
   2,451.18x = 3,678.59 × 990.34
4. Step 4: Simplify right side
   2,451.18x = 3,643,054.82
5. Step 5: Solve for x
   x = 3,643,054.82/2,451.18
6. Step 6: Final answer
   x = 1,486.25