Finding the Third Proportional to 1,058.91 and 1,210.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.91 : 1,210.78 = 1,210.78 : x
2. Step 2: Convert to fraction form
   1,058.91/1,210.78 = 1,210.78/x
3. Step 3: Cross multiply
   1,058.91x = 1,210.78 × 1,210.78
4. Step 4: Simplify right side
   1,058.91x = 1,465,991.24
5. Step 5: Solve for x
   x = 1,465,991.24/1,058.91
6. Step 6: Final answer
   x = 1,384.44