Finding the Fourth Proportional to 1,392.29, 1,918.99 and 1,274.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.29 : 1,918.99 = 1,274.59 : x
2. Step 2: Convert to fraction form
   1,392.29/1,918.99 = 1,274.59/x
3. Step 3: Cross multiply
   1,392.29x = 1,918.99 × 1,274.59
4. Step 4: Simplify right side
   1,392.29x = 2,445,925.46
5. Step 5: Solve for x
   x = 2,445,925.46/1,392.29
6. Step 6: Final answer
   x = 1,756.76