Finding the Fourth Proportional to 906.30, 1,362.15 and 890.10

Step by Step Solution

1. Step 1: Write the proportion equation
   906.30 : 1,362.15 = 890.10 : x
2. Step 2: Convert to fraction form
   906.30/1,362.15 = 890.10/x
3. Step 3: Cross multiply
   906.30x = 1,362.15 × 890.10
4. Step 4: Simplify right side
   906.30x = 1,212,449.72
5. Step 5: Solve for x
   x = 1,212,449.72/906.30
6. Step 6: Final answer
   x = 1,337.80