Finding the Fourth Proportional to 2,915.78, 4,025.38 and 1,922.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,915.78 : 4,025.38 = 1,922.72 : x
2. Step 2: Convert to fraction form
   2,915.78/4,025.38 = 1,922.72/x
3. Step 3: Cross multiply
   2,915.78x = 4,025.38 × 1,922.72
4. Step 4: Simplify right side
   2,915.78x = 7,739,678.63
5. Step 5: Solve for x
   x = 7,739,678.63/2,915.78
6. Step 6: Final answer
   x = 2,654.41