Finding the Fourth Proportional to 1,345.36, 1,858.50 and 1,280.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.36 : 1,858.50 = 1,280.56 : x
2. Step 2: Convert to fraction form
   1,345.36/1,858.50 = 1,280.56/x
3. Step 3: Cross multiply
   1,345.36x = 1,858.50 × 1,280.56
4. Step 4: Simplify right side
   1,345.36x = 2,379,920.76
5. Step 5: Solve for x
   x = 2,379,920.76/1,345.36
6. Step 6: Final answer
   x = 1,768.98