Finding the Fourth Proportional to 2,138.72, 2,950.56 and 1,299.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.72 : 2,950.56 = 1,299.44 : x
2. Step 2: Convert to fraction form
   2,138.72/2,950.56 = 1,299.44/x
3. Step 3: Cross multiply
   2,138.72x = 2,950.56 × 1,299.44
4. Step 4: Simplify right side
   2,138.72x = 3,834,075.69
5. Step 5: Solve for x
   x = 3,834,075.69/2,138.72
6. Step 6: Final answer
   x = 1,792.70