Finding the Fourth Proportional to 1,892.61, 2,838.15 and 722.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,892.61 : 2,838.15 = 722.21 : x
2. Step 2: Convert to fraction form
   1,892.61/2,838.15 = 722.21/x
3. Step 3: Cross multiply
   1,892.61x = 2,838.15 × 722.21
4. Step 4: Simplify right side
   1,892.61x = 2,049,726.12
5. Step 5: Solve for x
   x = 2,049,726.12/1,892.61
6. Step 6: Final answer
   x = 1,083.02