Finding the Fourth Proportional to 1,345.92, 1,856.94 and 821.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.92 : 1,856.94 = 821.58 : x
2. Step 2: Convert to fraction form
   1,345.92/1,856.94 = 821.58/x
3. Step 3: Cross multiply
   1,345.92x = 1,856.94 × 821.58
4. Step 4: Simplify right side
   1,345.92x = 1,525,624.77
5. Step 5: Solve for x
   x = 1,525,624.77/1,345.92
6. Step 6: Final answer
   x = 1,133.52