Finding the Fourth Proportional to 1,946.42, 2,916.28 and 1,287.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,946.42 : 2,916.28 = 1,287.69 : x
2. Step 2: Convert to fraction form
   1,946.42/2,916.28 = 1,287.69/x
3. Step 3: Cross multiply
   1,946.42x = 2,916.28 × 1,287.69
4. Step 4: Simplify right side
   1,946.42x = 3,755,264.59
5. Step 5: Solve for x
   x = 3,755,264.59/1,946.42
6. Step 6: Final answer
   x = 1,929.32