Finding the Fourth Proportional to 2,156.49, 2,980.67 and 1,813.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.49 : 2,980.67 = 1,813.05 : x
2. Step 2: Convert to fraction form
   2,156.49/2,980.67 = 1,813.05/x
3. Step 3: Cross multiply
   2,156.49x = 2,980.67 × 1,813.05
4. Step 4: Simplify right side
   2,156.49x = 5,404,094.68
5. Step 5: Solve for x
   x = 5,404,094.68/2,156.49
6. Step 6: Final answer
   x = 2,505.97