Finding the Fourth Proportional to 1,345.05, 1,855.71 and 785.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.05 : 1,855.71 = 785.34 : x
2. Step 2: Convert to fraction form
   1,345.05/1,855.71 = 785.34/x
3. Step 3: Cross multiply
   1,345.05x = 1,855.71 × 785.34
4. Step 4: Simplify right side
   1,345.05x = 1,457,363.29
5. Step 5: Solve for x
   x = 1,457,363.29/1,345.05
6. Step 6: Final answer
   x = 1,083.50