Finding the Fourth Proportional to 1,635.42, 2,256.69 and 972.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,635.42 : 2,256.69 = 972.30 : x
2. Step 2: Convert to fraction form
   1,635.42/2,256.69 = 972.30/x
3. Step 3: Cross multiply
   1,635.42x = 2,256.69 × 972.30
4. Step 4: Simplify right side
   1,635.42x = 2,194,179.69
5. Step 5: Solve for x
   x = 2,194,179.69/1,635.42
6. Step 6: Final answer
   x = 1,341.66