Finding the Fourth Proportional to 1,405.62, 1,940.49 and 1,172.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.62 : 1,940.49 = 1,172.34 : x
2. Step 2: Convert to fraction form
   1,405.62/1,940.49 = 1,172.34/x
3. Step 3: Cross multiply
   1,405.62x = 1,940.49 × 1,172.34
4. Step 4: Simplify right side
   1,405.62x = 2,274,914.05
5. Step 5: Solve for x
   x = 2,274,914.05/1,405.62
6. Step 6: Final answer
   x = 1,618.44