Finding the Fourth Proportional to 1,421.65, 1,961.82 and 792.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.65 : 1,961.82 = 792.15 : x
2. Step 2: Convert to fraction form
   1,421.65/1,961.82 = 792.15/x
3. Step 3: Cross multiply
   1,421.65x = 1,961.82 × 792.15
4. Step 4: Simplify right side
   1,421.65x = 1,554,055.71
5. Step 5: Solve for x
   x = 1,554,055.71/1,421.65
6. Step 6: Final answer
   x = 1,093.14