Finding the Fourth Proportional to 1,345.84, 1,853 and 1,222.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.84 : 1,853 = 1,222.80 : x
2. Step 2: Convert to fraction form
   1,345.84/1,853 = 1,222.80/x
3. Step 3: Cross multiply
   1,345.84x = 1,853 × 1,222.80
4. Step 4: Simplify right side
   1,345.84x = 2,265,848.40
5. Step 5: Solve for x
   x = 2,265,848.40/1,345.84
6. Step 6: Final answer
   x = 1,683.59