Finding the Fourth Proportional to 2,653.90, 3,980.04 and 922.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.90 : 3,980.04 = 922.12 : x
2. Step 2: Convert to fraction form
   2,653.90/3,980.04 = 922.12/x
3. Step 3: Cross multiply
   2,653.90x = 3,980.04 × 922.12
4. Step 4: Simplify right side
   2,653.90x = 3,670,061.08
5. Step 5: Solve for x
   x = 3,670,061.08/2,653.90
6. Step 6: Final answer
   x = 1,382.89