Finding the Fourth Proportional to 2,016.63, 2,784.69 and 1,386.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.63 : 2,784.69 = 1,386.99 : x
2. Step 2: Convert to fraction form
   2,016.63/2,784.69 = 1,386.99/x
3. Step 3: Cross multiply
   2,016.63x = 2,784.69 × 1,386.99
4. Step 4: Simplify right side
   2,016.63x = 3,862,337.18
5. Step 5: Solve for x
   x = 3,862,337.18/2,016.63
6. Step 6: Final answer
   x = 1,915.24