Finding the Fourth Proportional to 2,156.02, 3,234.51 and 857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.02 : 3,234.51 = 857.50 : x
2. Step 2: Convert to fraction form
   2,156.02/3,234.51 = 857.50/x
3. Step 3: Cross multiply
   2,156.02x = 3,234.51 × 857.50
4. Step 4: Simplify right side
   2,156.02x = 2,773,592.33
5. Step 5: Solve for x
   x = 2,773,592.33/2,156.02
6. Step 6: Final answer
   x = 1,286.44