Finding the Fourth Proportional to 1,428.28, 1,970.76 and 904.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.28 : 1,970.76 = 904.48 : x
2. Step 2: Convert to fraction form
   1,428.28/1,970.76 = 904.48/x
3. Step 3: Cross multiply
   1,428.28x = 1,970.76 × 904.48
4. Step 4: Simplify right side
   1,428.28x = 1,782,513.00
5. Step 5: Solve for x
   x = 1,782,513.00/1,428.28
6. Step 6: Final answer
   x = 1,248.01