Finding the Fourth Proportional to 1,554.72, 2,319.90 and 1,391.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,554.72 : 2,319.90 = 1,391.28 : x
2. Step 2: Convert to fraction form
   1,554.72/2,319.90 = 1,391.28/x
3. Step 3: Cross multiply
   1,554.72x = 2,319.90 × 1,391.28
4. Step 4: Simplify right side
   1,554.72x = 3,227,630.47
5. Step 5: Solve for x
   x = 3,227,630.47/1,554.72
6. Step 6: Final answer
   x = 2,076.02