Finding the Fourth Proportional to 1,912.01, 2,638.69 and 1,072.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.01 : 2,638.69 = 1,072.70 : x
2. Step 2: Convert to fraction form
   1,912.01/2,638.69 = 1,072.70/x
3. Step 3: Cross multiply
   1,912.01x = 2,638.69 × 1,072.70
4. Step 4: Simplify right side
   1,912.01x = 2,830,522.76
5. Step 5: Solve for x
   x = 2,830,522.76/1,912.01
6. Step 6: Final answer
   x = 1,480.39