Finding the Fourth Proportional to 1,139.34, 1,570.41 and 902.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.34 : 1,570.41 = 902.82 : x
2. Step 2: Convert to fraction form
   1,139.34/1,570.41 = 902.82/x
3. Step 3: Cross multiply
   1,139.34x = 1,570.41 × 902.82
4. Step 4: Simplify right side
   1,139.34x = 1,417,797.56
5. Step 5: Solve for x
   x = 1,417,797.56/1,139.34
6. Step 6: Final answer
   x = 1,244.40