Finding the Fourth Proportional to 1,387.95, 1,914.82 and 798.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.95 : 1,914.82 = 798.17 : x
2. Step 2: Convert to fraction form
   1,387.95/1,914.82 = 798.17/x
3. Step 3: Cross multiply
   1,387.95x = 1,914.82 × 798.17
4. Step 4: Simplify right side
   1,387.95x = 1,528,340.31
5. Step 5: Solve for x
   x = 1,528,340.31/1,387.95
6. Step 6: Final answer
   x = 1,101.15