Finding the Third Proportional to 1,588.78 and 3,478.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,588.78 : 3,478.78 = 3,478.78 : x
2. Step 2: Convert to fraction form
   1,588.78/3,478.78 = 3,478.78/x
3. Step 3: Cross multiply
   1,588.78x = 3,478.78 × 3,478.78
4. Step 4: Simplify right side
   1,588.78x = 12,101,918.99
5. Step 5: Solve for x
   x = 12,101,918.99/1,588.78
6. Step 6: Final answer
   x = 7,617.11