Finding the Fourth Proportional to 1,345.53, 1,856.84 and 786.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.53 : 1,856.84 = 786.34 : x
2. Step 2: Convert to fraction form
   1,345.53/1,856.84 = 786.34/x
3. Step 3: Cross multiply
   1,345.53x = 1,856.84 × 786.34
4. Step 4: Simplify right side
   1,345.53x = 1,460,110.38
5. Step 5: Solve for x
   x = 1,460,110.38/1,345.53
6. Step 6: Final answer
   x = 1,085.16