Finding the Fourth Proportional to 1,986.72, 2,741.69 and 1,102.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.72 : 2,741.69 = 1,102.61 : x
2. Step 2: Convert to fraction form
   1,986.72/2,741.69 = 1,102.61/x
3. Step 3: Cross multiply
   1,986.72x = 2,741.69 × 1,102.61
4. Step 4: Simplify right side
   1,986.72x = 3,023,003.86
5. Step 5: Solve for x
   x = 3,023,003.86/1,986.72
6. Step 6: Final answer
   x = 1,521.61