Finding the Fourth Proportional to 1,642.67, 2,267.30 and 1,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.67 : 2,267.30 = 1,111.31 : x
2. Step 2: Convert to fraction form
   1,642.67/2,267.30 = 1,111.31/x
3. Step 3: Cross multiply
   1,642.67x = 2,267.30 × 1,111.31
4. Step 4: Simplify right side
   1,642.67x = 2,519,673.16
5. Step 5: Solve for x
   x = 2,519,673.16/1,642.67
6. Step 6: Final answer
   x = 1,533.89