Finding the Fourth Proportional to 1,345.74, 1,856.94 and 786.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.74 : 1,856.94 = 786.30 : x
2. Step 2: Convert to fraction form
   1,345.74/1,856.94 = 786.30/x
3. Step 3: Cross multiply
   1,345.74x = 1,856.94 × 786.30
4. Step 4: Simplify right side
   1,345.74x = 1,460,111.92
5. Step 5: Solve for x
   x = 1,460,111.92/1,345.74
6. Step 6: Final answer
   x = 1,084.99