Finding the Fourth Proportional to 1,514.52, 2,088.72 and 990

Step by Step Solution

1. Step 1: Write the proportion equation
   1,514.52 : 2,088.72 = 990 : x
2. Step 2: Convert to fraction form
   1,514.52/2,088.72 = 990/x
3. Step 3: Cross multiply
   1,514.52x = 2,088.72 × 990
4. Step 4: Simplify right side
   1,514.52x = 2,067,832.80
5. Step 5: Solve for x
   x = 2,067,832.80/1,514.52
6. Step 6: Final answer
   x = 1,365.34