Finding the Fourth Proportional to 1,327.29, 1,987.15 and 1,053.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.29 : 1,987.15 = 1,053.78 : x
2. Step 2: Convert to fraction form
   1,327.29/1,987.15 = 1,053.78/x
3. Step 3: Cross multiply
   1,327.29x = 1,987.15 × 1,053.78
4. Step 4: Simplify right side
   1,327.29x = 2,094,018.93
5. Step 5: Solve for x
   x = 2,094,018.93/1,327.29
6. Step 6: Final answer
   x = 1,577.66