Finding the Fourth Proportional to 2,147.95, 3,222.96 and 915.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.95 : 3,222.96 = 915.71 : x
2. Step 2: Convert to fraction form
   2,147.95/3,222.96 = 915.71/x
3. Step 3: Cross multiply
   2,147.95x = 3,222.96 × 915.71
4. Step 4: Simplify right side
   2,147.95x = 2,951,277.15
5. Step 5: Solve for x
   x = 2,951,277.15/2,147.95
6. Step 6: Final answer
   x = 1,374.00