Finding the Fourth Proportional to 1,931.51, 2,664.28 and 1,145

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.51 : 2,664.28 = 1,145 : x
2. Step 2: Convert to fraction form
   1,931.51/2,664.28 = 1,145/x
3. Step 3: Cross multiply
   1,931.51x = 2,664.28 × 1,145
4. Step 4: Simplify right side
   1,931.51x = 3,050,600.60
5. Step 5: Solve for x
   x = 3,050,600.60/1,931.51
6. Step 6: Final answer
   x = 1,579.39