Finding the Fourth Proportional to 1,931.45, 2,665.40 and 1,047.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.45 : 2,665.40 = 1,047.25 : x
2. Step 2: Convert to fraction form
   1,931.45/2,665.40 = 1,047.25/x
3. Step 3: Cross multiply
   1,931.45x = 2,665.40 × 1,047.25
4. Step 4: Simplify right side
   1,931.45x = 2,791,340.15
5. Step 5: Solve for x
   x = 2,791,340.15/1,931.45
6. Step 6: Final answer
   x = 1,445.20