Finding the Fourth Proportional to 1,435.13, 1,974.78 and 1,392.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.13 : 1,974.78 = 1,392.31 : x
2. Step 2: Convert to fraction form
   1,435.13/1,974.78 = 1,392.31/x
3. Step 3: Cross multiply
   1,435.13x = 1,974.78 × 1,392.31
4. Step 4: Simplify right side
   1,435.13x = 2,749,505.94
5. Step 5: Solve for x
   x = 2,749,505.94/1,435.13
6. Step 6: Final answer
   x = 1,915.86