Finding the Fourth Proportional to 1,911.78, 2,637.90 and 1,322.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.78 : 2,637.90 = 1,322.10 : x
2. Step 2: Convert to fraction form
   1,911.78/2,637.90 = 1,322.10/x
3. Step 3: Cross multiply
   1,911.78x = 2,637.90 × 1,322.10
4. Step 4: Simplify right side
   1,911.78x = 3,487,567.59
5. Step 5: Solve for x
   x = 3,487,567.59/1,911.78
6. Step 6: Final answer
   x = 1,824.25