Finding the Fourth Proportional to 1,387.34, 1,914.72 and 797.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.34 : 1,914.72 = 797.90 : x
2. Step 2: Convert to fraction form
   1,387.34/1,914.72 = 797.90/x
3. Step 3: Cross multiply
   1,387.34x = 1,914.72 × 797.90
4. Step 4: Simplify right side
   1,387.34x = 1,527,755.09
5. Step 5: Solve for x
   x = 1,527,755.09/1,387.34
6. Step 6: Final answer
   x = 1,101.21