Finding the Fourth Proportional to 2,148.44, 3,222.83 and 915.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.44 : 3,222.83 = 915.86 : x
2. Step 2: Convert to fraction form
   2,148.44/3,222.83 = 915.86/x
3. Step 3: Cross multiply
   2,148.44x = 3,222.83 × 915.86
4. Step 4: Simplify right side
   2,148.44x = 2,951,659.79
5. Step 5: Solve for x
   x = 2,951,659.79/2,148.44
6. Step 6: Final answer
   x = 1,373.86