Finding the Fourth Proportional to 1,621.35, 2,429.06 and 891.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.35 : 2,429.06 = 891.81 : x
2. Step 2: Convert to fraction form
   1,621.35/2,429.06 = 891.81/x
3. Step 3: Cross multiply
   1,621.35x = 2,429.06 × 891.81
4. Step 4: Simplify right side
   1,621.35x = 2,166,255.54
5. Step 5: Solve for x
   x = 2,166,255.54/1,621.35
6. Step 6: Final answer
   x = 1,336.08