Finding the Fourth Proportional to 1,830.72, 2,742.63 and 905.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,830.72 : 2,742.63 = 905.21 : x
2. Step 2: Convert to fraction form
   1,830.72/2,742.63 = 905.21/x
3. Step 3: Cross multiply
   1,830.72x = 2,742.63 × 905.21
4. Step 4: Simplify right side
   1,830.72x = 2,482,642.39
5. Step 5: Solve for x
   x = 2,482,642.39/1,830.72
6. Step 6: Final answer
   x = 1,356.10