Finding the Fourth Proportional to 1,327.59, 1,988.15 and 1,288.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.59 : 1,988.15 = 1,288.71 : x
2. Step 2: Convert to fraction form
   1,327.59/1,988.15 = 1,288.71/x
3. Step 3: Cross multiply
   1,327.59x = 1,988.15 × 1,288.71
4. Step 4: Simplify right side
   1,327.59x = 2,562,142.34
5. Step 5: Solve for x
   x = 2,562,142.34/1,327.59
6. Step 6: Final answer
   x = 1,929.92