Finding the Fourth Proportional to 1,387.50, 1,914.81 and 798.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.50 : 1,914.81 = 798.22 : x
2. Step 2: Convert to fraction form
   1,387.50/1,914.81 = 798.22/x
3. Step 3: Cross multiply
   1,387.50x = 1,914.81 × 798.22
4. Step 4: Simplify right side
   1,387.50x = 1,528,439.04
5. Step 5: Solve for x
   x = 1,528,439.04/1,387.50
6. Step 6: Final answer
   x = 1,101.58