Finding the Fourth Proportional to 1,141.57, 1,573.03 and 787.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.57 : 1,573.03 = 787.60 : x
2. Step 2: Convert to fraction form
   1,141.57/1,573.03 = 787.60/x
3. Step 3: Cross multiply
   1,141.57x = 1,573.03 × 787.60
4. Step 4: Simplify right side
   1,141.57x = 1,238,918.43
5. Step 5: Solve for x
   x = 1,238,918.43/1,141.57
6. Step 6: Final answer
   x = 1,085.28