Finding the Fourth Proportional to 1,345.57, 1,857.59 and 841.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.57 : 1,857.59 = 841.57 : x
2. Step 2: Convert to fraction form
   1,345.57/1,857.59 = 841.57/x
3. Step 3: Cross multiply
   1,345.57x = 1,857.59 × 841.57
4. Step 4: Simplify right side
   1,345.57x = 1,563,292.02
5. Step 5: Solve for x
   x = 1,563,292.02/1,345.57
6. Step 6: Final answer
   x = 1,161.81