Finding the Fourth Proportional to 1,922.15, 2,653.61 and 1,215.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,922.15 : 2,653.61 = 1,215.02 : x
2. Step 2: Convert to fraction form
   1,922.15/2,653.61 = 1,215.02/x
3. Step 3: Cross multiply
   1,922.15x = 2,653.61 × 1,215.02
4. Step 4: Simplify right side
   1,922.15x = 3,224,181.69
5. Step 5: Solve for x
   x = 3,224,181.69/1,922.15
6. Step 6: Final answer
   x = 1,677.39