Finding the Fourth Proportional to 1,911.88, 2,638.54 and 1,072.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.88 : 2,638.54 = 1,072.76 : x
2. Step 2: Convert to fraction form
   1,911.88/2,638.54 = 1,072.76/x
3. Step 3: Cross multiply
   1,911.88x = 2,638.54 × 1,072.76
4. Step 4: Simplify right side
   1,911.88x = 2,830,520.17
5. Step 5: Solve for x
   x = 2,830,520.17/1,911.88
6. Step 6: Final answer
   x = 1,480.49