Finding the Fourth Proportional to 2,981.47, 4,112.56 and 1,920.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,981.47 : 4,112.56 = 1,920.61 : x
2. Step 2: Convert to fraction form
   2,981.47/4,112.56 = 1,920.61/x
3. Step 3: Cross multiply
   2,981.47x = 4,112.56 × 1,920.61
4. Step 4: Simplify right side
   2,981.47x = 7,898,623.86
5. Step 5: Solve for x
   x = 7,898,623.86/2,981.47
6. Step 6: Final answer
   x = 2,649.24