Finding the Fourth Proportional to 1,691.78, 2,334.71 and 945.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,691.78 : 2,334.71 = 945.79 : x
2. Step 2: Convert to fraction form
   1,691.78/2,334.71 = 945.79/x
3. Step 3: Cross multiply
   1,691.78x = 2,334.71 × 945.79
4. Step 4: Simplify right side
   1,691.78x = 2,208,141.90
5. Step 5: Solve for x
   x = 2,208,141.90/1,691.78
6. Step 6: Final answer
   x = 1,305.22