Finding the Fourth Proportional to 1,145.17, 1,581.63 and 773.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.17 : 1,581.63 = 773.69 : x
2. Step 2: Convert to fraction form
   1,145.17/1,581.63 = 773.69/x
3. Step 3: Cross multiply
   1,145.17x = 1,581.63 × 773.69
4. Step 4: Simplify right side
   1,145.17x = 1,223,680.51
5. Step 5: Solve for x
   x = 1,223,680.51/1,145.17
6. Step 6: Final answer
   x = 1,068.56