Finding the Fourth Proportional to 1,375.40, 1,895.64 and 1,222.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.40 : 1,895.64 = 1,222.71 : x
2. Step 2: Convert to fraction form
   1,375.40/1,895.64 = 1,222.71/x
3. Step 3: Cross multiply
   1,375.40x = 1,895.64 × 1,222.71
4. Step 4: Simplify right side
   1,375.40x = 2,317,817.98
5. Step 5: Solve for x
   x = 2,317,817.98/1,375.40
6. Step 6: Final answer
   x = 1,685.20