Finding the Fourth Proportional to 1,635.71, 2,257.61 and 972.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,635.71 : 2,257.61 = 972.43 : x
2. Step 2: Convert to fraction form
   1,635.71/2,257.61 = 972.43/x
3. Step 3: Cross multiply
   1,635.71x = 2,257.61 × 972.43
4. Step 4: Simplify right side
   1,635.71x = 2,195,362.83
5. Step 5: Solve for x
   x = 2,195,362.83/1,635.71
6. Step 6: Final answer
   x = 1,342.15