Finding the Fourth Proportional to 1,434.30, 1,978.66 and 902.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.30 : 1,978.66 = 902.94 : x
2. Step 2: Convert to fraction form
   1,434.30/1,978.66 = 902.94/x
3. Step 3: Cross multiply
   1,434.30x = 1,978.66 × 902.94
4. Step 4: Simplify right side
   1,434.30x = 1,786,611.26
5. Step 5: Solve for x
   x = 1,786,611.26/1,434.30
6. Step 6: Final answer
   x = 1,245.63