Finding the Fourth Proportional to 1,931.51, 2,665.49 and 1,047.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.51 : 2,665.49 = 1,047.31 : x
2. Step 2: Convert to fraction form
   1,931.51/2,665.49 = 1,047.31/x
3. Step 3: Cross multiply
   1,931.51x = 2,665.49 × 1,047.31
4. Step 4: Simplify right side
   1,931.51x = 2,791,582.43
5. Step 5: Solve for x
   x = 2,791,582.43/1,931.51
6. Step 6: Final answer
   x = 1,445.28