Finding the Fourth Proportional to 1,388.12, 1,914.89 and 940.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.12 : 1,914.89 = 940.01 : x
2. Step 2: Convert to fraction form
   1,388.12/1,914.89 = 940.01/x
3. Step 3: Cross multiply
   1,388.12x = 1,914.89 × 940.01
4. Step 4: Simplify right side
   1,388.12x = 1,800,001.47
5. Step 5: Solve for x
   x = 1,800,001.47/1,388.12
6. Step 6: Final answer
   x = 1,296.72