Finding the Fourth Proportional to 1,784.61, 2,671.20 and 1,289.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,784.61 : 2,671.20 = 1,289.07 : x
2. Step 2: Convert to fraction form
   1,784.61/2,671.20 = 1,289.07/x
3. Step 3: Cross multiply
   1,784.61x = 2,671.20 × 1,289.07
4. Step 4: Simplify right side
   1,784.61x = 3,443,363.78
5. Step 5: Solve for x
   x = 3,443,363.78/1,784.61
6. Step 6: Final answer
   x = 1,929.48