Finding the Fourth Proportional to 1,387.63, 1,914.71 and 798.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.63 : 1,914.71 = 798.05 : x
2. Step 2: Convert to fraction form
   1,387.63/1,914.71 = 798.05/x
3. Step 3: Cross multiply
   1,387.63x = 1,914.71 × 798.05
4. Step 4: Simplify right side
   1,387.63x = 1,528,034.32
5. Step 5: Solve for x
   x = 1,528,034.32/1,387.63
6. Step 6: Final answer
   x = 1,101.18