Finding the Fourth Proportional to 1,210.81, 1,814.72 and 862.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.81 : 1,814.72 = 862.25 : x
2. Step 2: Convert to fraction form
   1,210.81/1,814.72 = 862.25/x
3. Step 3: Cross multiply
   1,210.81x = 1,814.72 × 862.25
4. Step 4: Simplify right side
   1,210.81x = 1,564,742.32
5. Step 5: Solve for x
   x = 1,564,742.32/1,210.81
6. Step 6: Final answer
   x = 1,292.31