Finding the Fourth Proportional to 1,335.32, 1,992.78 and 1,189.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.32 : 1,992.78 = 1,189.52 : x
2. Step 2: Convert to fraction form
   1,335.32/1,992.78 = 1,189.52/x
3. Step 3: Cross multiply
   1,335.32x = 1,992.78 × 1,189.52
4. Step 4: Simplify right side
   1,335.32x = 2,370,451.67
5. Step 5: Solve for x
   x = 2,370,451.67/1,335.32
6. Step 6: Final answer
   x = 1,775.19