Finding the Fourth Proportional to 1,348.72, 2,011.76 and 1,290.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.72 : 2,011.76 = 1,290.40 : x
2. Step 2: Convert to fraction form
   1,348.72/2,011.76 = 1,290.40/x
3. Step 3: Cross multiply
   1,348.72x = 2,011.76 × 1,290.40
4. Step 4: Simplify right side
   1,348.72x = 2,595,975.10
5. Step 5: Solve for x
   x = 2,595,975.10/1,348.72
6. Step 6: Final answer
   x = 1,924.77