Finding the Fourth Proportional to 1,387.39, 1,914.55 and 797.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.39 : 1,914.55 = 797.91 : x
2. Step 2: Convert to fraction form
   1,387.39/1,914.55 = 797.91/x
3. Step 3: Cross multiply
   1,387.39x = 1,914.55 × 797.91
4. Step 4: Simplify right side
   1,387.39x = 1,527,638.59
5. Step 5: Solve for x
   x = 1,527,638.59/1,387.39
6. Step 6: Final answer
   x = 1,101.09