Finding the Fourth Proportional to 1,345.31, 1,856.06 and 873.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.31 : 1,856.06 = 873.79 : x
2. Step 2: Convert to fraction form
   1,345.31/1,856.06 = 873.79/x
3. Step 3: Cross multiply
   1,345.31x = 1,856.06 × 873.79
4. Step 4: Simplify right side
   1,345.31x = 1,621,817.60
5. Step 5: Solve for x
   x = 1,621,817.60/1,345.31
6. Step 6: Final answer
   x = 1,205.54