Finding the Fourth Proportional to 1,389.56, 1,917.27 and 792.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.56 : 1,917.27 = 792.18 : x
2. Step 2: Convert to fraction form
   1,389.56/1,917.27 = 792.18/x
3. Step 3: Cross multiply
   1,389.56x = 1,917.27 × 792.18
4. Step 4: Simplify right side
   1,389.56x = 1,518,822.95
5. Step 5: Solve for x
   x = 1,518,822.95/1,389.56
6. Step 6: Final answer
   x = 1,093.03