Finding the Fourth Proportional to 1,387.16, 1,914.38 and 797.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.16 : 1,914.38 = 797.69 : x
2. Step 2: Convert to fraction form
   1,387.16/1,914.38 = 797.69/x
3. Step 3: Cross multiply
   1,387.16x = 1,914.38 × 797.69
4. Step 4: Simplify right side
   1,387.16x = 1,527,072.56
5. Step 5: Solve for x
   x = 1,527,072.56/1,387.16
6. Step 6: Final answer
   x = 1,100.86