Finding the Fourth Proportional to 1,719.72, 2,373.78 and 1,223.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,719.72 : 2,373.78 = 1,223.80 : x
2. Step 2: Convert to fraction form
   1,719.72/2,373.78 = 1,223.80/x
3. Step 3: Cross multiply
   1,719.72x = 2,373.78 × 1,223.80
4. Step 4: Simplify right side
   1,719.72x = 2,905,031.96
5. Step 5: Solve for x
   x = 2,905,031.96/1,719.72
6. Step 6: Final answer
   x = 1,689.25