Finding the Fourth Proportional to 1,345.69, 1,857.32 and 786.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.69 : 1,857.32 = 786.16 : x
2. Step 2: Convert to fraction form
   1,345.69/1,857.32 = 786.16/x
3. Step 3: Cross multiply
   1,345.69x = 1,857.32 × 786.16
4. Step 4: Simplify right side
   1,345.69x = 1,460,150.69
5. Step 5: Solve for x
   x = 1,460,150.69/1,345.69
6. Step 6: Final answer
   x = 1,085.06