Finding the Fourth Proportional to 1,386.72, 2,076.30 and 1,060.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.72 : 2,076.30 = 1,060.56 : x
2. Step 2: Convert to fraction form
   1,386.72/2,076.30 = 1,060.56/x
3. Step 3: Cross multiply
   1,386.72x = 2,076.30 × 1,060.56
4. Step 4: Simplify right side
   1,386.72x = 2,202,040.73
5. Step 5: Solve for x
   x = 2,202,040.73/1,386.72
6. Step 6: Final answer
   x = 1,587.95