Finding the Fourth Proportional to 1,153.18, 1,592.31 and 921.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.18 : 1,592.31 = 921.34 : x
2. Step 2: Convert to fraction form
   1,153.18/1,592.31 = 921.34/x
3. Step 3: Cross multiply
   1,153.18x = 1,592.31 × 921.34
4. Step 4: Simplify right side
   1,153.18x = 1,467,058.90
5. Step 5: Solve for x
   x = 1,467,058.90/1,153.18
6. Step 6: Final answer
   x = 1,272.19