Finding the Fourth Proportional to 2,780.13, 4,168.71 and 930.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.13 : 4,168.71 = 930.63 : x
2. Step 2: Convert to fraction form
   2,780.13/4,168.71 = 930.63/x
3. Step 3: Cross multiply
   2,780.13x = 4,168.71 × 930.63
4. Step 4: Simplify right side
   2,780.13x = 3,879,526.59
5. Step 5: Solve for x
   x = 3,879,526.59/2,780.13
6. Step 6: Final answer
   x = 1,395.45