Finding the Fourth Proportional to 1,685.41, 2,528.15 and 906.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.41 : 2,528.15 = 906.05 : x
2. Step 2: Convert to fraction form
   1,685.41/2,528.15 = 906.05/x
3. Step 3: Cross multiply
   1,685.41x = 2,528.15 × 906.05
4. Step 4: Simplify right side
   1,685.41x = 2,290,632.10
5. Step 5: Solve for x
   x = 2,290,632.10/1,685.41
6. Step 6: Final answer
   x = 1,359.10