Finding the Fourth Proportional to 1,429.05, 1,971.95 and 905.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.05 : 1,971.95 = 905.07 : x
2. Step 2: Convert to fraction form
   1,429.05/1,971.95 = 905.07/x
3. Step 3: Cross multiply
   1,429.05x = 1,971.95 × 905.07
4. Step 4: Simplify right side
   1,429.05x = 1,784,752.79
5. Step 5: Solve for x
   x = 1,784,752.79/1,429.05
6. Step 6: Final answer
   x = 1,248.91