Finding the Fourth Proportional to 1,389.57, 1,917.86 and 792.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.57 : 1,917.86 = 792.06 : x
2. Step 2: Convert to fraction form
   1,389.57/1,917.86 = 792.06/x
3. Step 3: Cross multiply
   1,389.57x = 1,917.86 × 792.06
4. Step 4: Simplify right side
   1,389.57x = 1,519,056.23
5. Step 5: Solve for x
   x = 1,519,056.23/1,389.57
6. Step 6: Final answer
   x = 1,093.18