Finding the Fourth Proportional to 1,200.30, 1,656.54 and 905.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.30 : 1,656.54 = 905.10 : x
2. Step 2: Convert to fraction form
   1,200.30/1,656.54 = 905.10/x
3. Step 3: Cross multiply
   1,200.30x = 1,656.54 × 905.10
4. Step 4: Simplify right side
   1,200.30x = 1,499,334.35
5. Step 5: Solve for x
   x = 1,499,334.35/1,200.30
6. Step 6: Final answer
   x = 1,249.13