Finding the Fourth Proportional to 1,386.88, 1,914.01 and 797.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.88 : 1,914.01 = 797.61 : x
2. Step 2: Convert to fraction form
   1,386.88/1,914.01 = 797.61/x
3. Step 3: Cross multiply
   1,386.88x = 1,914.01 × 797.61
4. Step 4: Simplify right side
   1,386.88x = 1,526,623.95
5. Step 5: Solve for x
   x = 1,526,623.95/1,386.88
6. Step 6: Final answer
   x = 1,100.76