Finding the Fourth Proportional to 2,155.06, 2,972.12 and 1,936.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.06 : 2,972.12 = 1,936.36 : x
2. Step 2: Convert to fraction form
   2,155.06/2,972.12 = 1,936.36/x
3. Step 3: Cross multiply
   2,155.06x = 2,972.12 × 1,936.36
4. Step 4: Simplify right side
   2,155.06x = 5,755,077.04
5. Step 5: Solve for x
   x = 5,755,077.04/2,155.06
6. Step 6: Final answer
   x = 2,670.50