Finding the Fourth Proportional to 1,192.78, 1,789.58 and 615.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,192.78 : 1,789.58 = 615.25 : x
2. Step 2: Convert to fraction form
   1,192.78/1,789.58 = 615.25/x
3. Step 3: Cross multiply
   1,192.78x = 1,789.58 × 615.25
4. Step 4: Simplify right side
   1,192.78x = 1,101,039.10
5. Step 5: Solve for x
   x = 1,101,039.10/1,192.78
6. Step 6: Final answer
   x = 923.09