Finding the Fourth Proportional to 1,698.84, 2,344.32 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,698.84 : 2,344.32 = 990.72 : x
2. Step 2: Convert to fraction form
   1,698.84/2,344.32 = 990.72/x
3. Step 3: Cross multiply
   1,698.84x = 2,344.32 × 990.72
4. Step 4: Simplify right side
   1,698.84x = 2,322,564.71
5. Step 5: Solve for x
   x = 2,322,564.71/1,698.84
6. Step 6: Final answer
   x = 1,367.15