Finding the Fourth Proportional to 1,742.78, 2,607.49 and 1,223.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,742.78 : 2,607.49 = 1,223.67 : x
2. Step 2: Convert to fraction form
   1,742.78/2,607.49 = 1,223.67/x
3. Step 3: Cross multiply
   1,742.78x = 2,607.49 × 1,223.67
4. Step 4: Simplify right side
   1,742.78x = 3,190,718.60
5. Step 5: Solve for x
   x = 3,190,718.60/1,742.78
6. Step 6: Final answer
   x = 1,830.82