Finding the Fourth Proportional to 1,356.84, 1,870.77 and 1,121.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.84 : 1,870.77 = 1,121.73 : x
2. Step 2: Convert to fraction form
   1,356.84/1,870.77 = 1,121.73/x
3. Step 3: Cross multiply
   1,356.84x = 1,870.77 × 1,121.73
4. Step 4: Simplify right side
   1,356.84x = 2,098,498.83
5. Step 5: Solve for x
   x = 2,098,498.83/1,356.84
6. Step 6: Final answer
   x = 1,546.61