Finding the Fourth Proportional to 1,434.48, 1,978.90 and 903.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.48 : 1,978.90 = 903.57 : x
2. Step 2: Convert to fraction form
   1,434.48/1,978.90 = 903.57/x
3. Step 3: Cross multiply
   1,434.48x = 1,978.90 × 903.57
4. Step 4: Simplify right side
   1,434.48x = 1,788,074.67
5. Step 5: Solve for x
   x = 1,788,074.67/1,434.48
6. Step 6: Final answer
   x = 1,246.50