Finding the Fourth Proportional to 1,514.84, 2,090.81 and 990.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,514.84 : 2,090.81 = 990.56 : x
2. Step 2: Convert to fraction form
   1,514.84/2,090.81 = 990.56/x
3. Step 3: Cross multiply
   1,514.84x = 2,090.81 × 990.56
4. Step 4: Simplify right side
   1,514.84x = 2,071,080.46
5. Step 5: Solve for x
   x = 2,071,080.46/1,514.84
6. Step 6: Final answer
   x = 1,367.20