Finding the Fourth Proportional to 2,100.89, 3,147.91 and 1,276.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.89 : 3,147.91 = 1,276.67 : x
2. Step 2: Convert to fraction form
   2,100.89/3,147.91 = 1,276.67/x
3. Step 3: Cross multiply
   2,100.89x = 3,147.91 × 1,276.67
4. Step 4: Simplify right side
   2,100.89x = 4,018,846.94
5. Step 5: Solve for x
   x = 4,018,846.94/2,100.89
6. Step 6: Final answer
   x = 1,912.92