Finding the Fourth Proportional to 1,381.61, 1,906.79 and 792.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.61 : 1,906.79 = 792.11 : x
2. Step 2: Convert to fraction form
   1,381.61/1,906.79 = 792.11/x
3. Step 3: Cross multiply
   1,381.61x = 1,906.79 × 792.11
4. Step 4: Simplify right side
   1,381.61x = 1,510,373.93
5. Step 5: Solve for x
   x = 1,510,373.93/1,381.61
6. Step 6: Final answer
   x = 1,093.20