Finding the Fourth Proportional to 1,158.31, 1,598.56 and 660.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.31 : 1,598.56 = 660.84 : x
2. Step 2: Convert to fraction form
   1,158.31/1,598.56 = 660.84/x
3. Step 3: Cross multiply
   1,158.31x = 1,598.56 × 660.84
4. Step 4: Simplify right side
   1,158.31x = 1,056,384.40
5. Step 5: Solve for x
   x = 1,056,384.40/1,158.31
6. Step 6: Final answer
   x = 912.00