Finding the Fourth Proportional to 1,431.30, 1,976.49 and 907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.30 : 1,976.49 = 907.50 : x
2. Step 2: Convert to fraction form
   1,431.30/1,976.49 = 907.50/x
3. Step 3: Cross multiply
   1,431.30x = 1,976.49 × 907.50
4. Step 4: Simplify right side
   1,431.30x = 1,793,664.68
5. Step 5: Solve for x
   x = 1,793,664.68/1,431.30
6. Step 6: Final answer
   x = 1,253.17