Finding the Fourth Proportional to 1,145.53, 1,580.31 and 673.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.53 : 1,580.31 = 673.45 : x
2. Step 2: Convert to fraction form
   1,145.53/1,580.31 = 673.45/x
3. Step 3: Cross multiply
   1,145.53x = 1,580.31 × 673.45
4. Step 4: Simplify right side
   1,145.53x = 1,064,259.77
5. Step 5: Solve for x
   x = 1,064,259.77/1,145.53
6. Step 6: Final answer
   x = 929.05