Finding the Fourth Proportional to 1,659.92, 2,290.63 and 987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.92 : 2,290.63 = 987.72 : x
2. Step 2: Convert to fraction form
   1,659.92/2,290.63 = 987.72/x
3. Step 3: Cross multiply
   1,659.92x = 2,290.63 × 987.72
4. Step 4: Simplify right side
   1,659.92x = 2,262,491.86
5. Step 5: Solve for x
   x = 2,262,491.86/1,659.92
6. Step 6: Final answer
   x = 1,363.02