Finding the Fourth Proportional to 1,642.64, 2,267.72 and 1,111.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.64 : 2,267.72 = 1,111.92 : x
2. Step 2: Convert to fraction form
   1,642.64/2,267.72 = 1,111.92/x
3. Step 3: Cross multiply
   1,642.64x = 2,267.72 × 1,111.92
4. Step 4: Simplify right side
   1,642.64x = 2,521,523.22
5. Step 5: Solve for x
   x = 2,521,523.22/1,642.64
6. Step 6: Final answer
   x = 1,535.04