Finding the Fourth Proportional to 2,147.09, 3,219.82 and 915.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.09 : 3,219.82 = 915.08 : x
2. Step 2: Convert to fraction form
   2,147.09/3,219.82 = 915.08/x
3. Step 3: Cross multiply
   2,147.09x = 3,219.82 × 915.08
4. Step 4: Simplify right side
   2,147.09x = 2,946,392.89
5. Step 5: Solve for x
   x = 2,946,392.89/2,147.09
6. Step 6: Final answer
   x = 1,372.27