Finding the Fourth Proportional to 1,388.71, 1,913.17 and 968.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.71 : 1,913.17 = 968.30 : x
2. Step 2: Convert to fraction form
   1,388.71/1,913.17 = 968.30/x
3. Step 3: Cross multiply
   1,388.71x = 1,913.17 × 968.30
4. Step 4: Simplify right side
   1,388.71x = 1,852,522.51
5. Step 5: Solve for x
   x = 1,852,522.51/1,388.71
6. Step 6: Final answer
   x = 1,333.99