Finding the Fourth Proportional to 2,792.61, 4,189.55 and 918.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,792.61 : 4,189.55 = 918.63 : x
2. Step 2: Convert to fraction form
   2,792.61/4,189.55 = 918.63/x
3. Step 3: Cross multiply
   2,792.61x = 4,189.55 × 918.63
4. Step 4: Simplify right side
   2,792.61x = 3,848,641.72
5. Step 5: Solve for x
   x = 3,848,641.72/2,792.61
6. Step 6: Final answer
   x = 1,378.15