Finding the Fourth Proportional to 1,574.91, 2,172.83 and 902.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.91 : 2,172.83 = 902.61 : x
2. Step 2: Convert to fraction form
   1,574.91/2,172.83 = 902.61/x
3. Step 3: Cross multiply
   1,574.91x = 2,172.83 × 902.61
4. Step 4: Simplify right side
   1,574.91x = 1,961,213.57
5. Step 5: Solve for x
   x = 1,961,213.57/1,574.91
6. Step 6: Final answer
   x = 1,245.29