Finding the Fourth Proportional to 1,387.17, 1,914.71 and 798.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.17 : 1,914.71 = 798.12 : x
2. Step 2: Convert to fraction form
   1,387.17/1,914.71 = 798.12/x
3. Step 3: Cross multiply
   1,387.17x = 1,914.71 × 798.12
4. Step 4: Simplify right side
   1,387.17x = 1,528,164.35
5. Step 5: Solve for x
   x = 1,528,164.35/1,387.17
6. Step 6: Final answer
   x = 1,101.64