Finding the Fourth Proportional to 1,281.89, 1,921.12 and 972.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.89 : 1,921.12 = 972.81 : x
2. Step 2: Convert to fraction form
   1,281.89/1,921.12 = 972.81/x
3. Step 3: Cross multiply
   1,281.89x = 1,921.12 × 972.81
4. Step 4: Simplify right side
   1,281.89x = 1,868,882.32
5. Step 5: Solve for x
   x = 1,868,882.32/1,281.89
6. Step 6: Final answer
   x = 1,457.91