Finding the Fourth Proportional to 1,911.72, 2,638.18 and 1,072.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.72 : 2,638.18 = 1,072.46 : x
2. Step 2: Convert to fraction form
   1,911.72/2,638.18 = 1,072.46/x
3. Step 3: Cross multiply
   1,911.72x = 2,638.18 × 1,072.46
4. Step 4: Simplify right side
   1,911.72x = 2,829,342.52
5. Step 5: Solve for x
   x = 2,829,342.52/1,911.72
6. Step 6: Final answer
   x = 1,480.00