Finding the Fourth Proportional to 1,345.83, 1,857.15 and 786.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.83 : 1,857.15 = 786.45 : x
2. Step 2: Convert to fraction form
   1,345.83/1,857.15 = 786.45/x
3. Step 3: Cross multiply
   1,345.83x = 1,857.15 × 786.45
4. Step 4: Simplify right side
   1,345.83x = 1,460,555.62
5. Step 5: Solve for x
   x = 1,460,555.62/1,345.83
6. Step 6: Final answer
   x = 1,085.25