Finding the Fourth Proportional to 2,156.02, 2,974.14 and 1,780.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.02 : 2,974.14 = 1,780.81 : x
2. Step 2: Convert to fraction form
   2,156.02/2,974.14 = 1,780.81/x
3. Step 3: Cross multiply
   2,156.02x = 2,974.14 × 1,780.81
4. Step 4: Simplify right side
   2,156.02x = 5,296,378.25
5. Step 5: Solve for x
   x = 5,296,378.25/2,156.02
6. Step 6: Final answer
   x = 2,456.55