Finding the Fourth Proportional to 1,173.18, 1,620.91 and 926.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.18 : 1,620.91 = 926.38 : x
2. Step 2: Convert to fraction form
   1,173.18/1,620.91 = 926.38/x
3. Step 3: Cross multiply
   1,173.18x = 1,620.91 × 926.38
4. Step 4: Simplify right side
   1,173.18x = 1,501,578.61
5. Step 5: Solve for x
   x = 1,501,578.61/1,173.18
6. Step 6: Final answer
   x = 1,279.92