Finding the Fourth Proportional to 2,289.76, 3,432.72 and 1,315.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.76 : 3,432.72 = 1,315.52 : x
2. Step 2: Convert to fraction form
   2,289.76/3,432.72 = 1,315.52/x
3. Step 3: Cross multiply
   2,289.76x = 3,432.72 × 1,315.52
4. Step 4: Simplify right side
   2,289.76x = 4,515,811.81
5. Step 5: Solve for x
   x = 4,515,811.81/2,289.76
6. Step 6: Final answer
   x = 1,972.18