Finding the Fourth Proportional to 3,978.48, 5,969.70 and 1,788

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.48 : 5,969.70 = 1,788 : x
2. Step 2: Convert to fraction form
   3,978.48/5,969.70 = 1,788/x
3. Step 3: Cross multiply
   3,978.48x = 5,969.70 × 1,788
4. Step 4: Simplify right side
   3,978.48x = 10,673,823.60
5. Step 5: Solve for x
   x = 10,673,823.60/3,978.48
6. Step 6: Final answer
   x = 2,682.89