Finding the Fourth Proportional to 1,210.82, 1,662.86 and 1,013.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.82 : 1,662.86 = 1,013.99 : x
2. Step 2: Convert to fraction form
   1,210.82/1,662.86 = 1,013.99/x
3. Step 3: Cross multiply
   1,210.82x = 1,662.86 × 1,013.99
4. Step 4: Simplify right side
   1,210.82x = 1,686,117.63
5. Step 5: Solve for x
   x = 1,686,117.63/1,210.82
6. Step 6: Final answer
   x = 1,392.55