Finding the Fourth Proportional to 1,345.82, 1,857.67 and 872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.82 : 1,857.67 = 872.88 : x
2. Step 2: Convert to fraction form
   1,345.82/1,857.67 = 872.88/x
3. Step 3: Cross multiply
   1,345.82x = 1,857.67 × 872.88
4. Step 4: Simplify right side
   1,345.82x = 1,621,520.81
5. Step 5: Solve for x
   x = 1,621,520.81/1,345.82
6. Step 6: Final answer
   x = 1,204.85