Finding the Fourth Proportional to 1,514.70, 2,090.25 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,514.70 : 2,090.25 = 990.72 : x
2. Step 2: Convert to fraction form
   1,514.70/2,090.25 = 990.72/x
3. Step 3: Cross multiply
   1,514.70x = 2,090.25 × 990.72
4. Step 4: Simplify right side
   1,514.70x = 2,070,852.48
5. Step 5: Solve for x
   x = 2,070,852.48/1,514.70
6. Step 6: Final answer
   x = 1,367.17