Finding the Fourth Proportional to 2,478.86, 3,720.16 and 919.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.86 : 3,720.16 = 919.82 : x
2. Step 2: Convert to fraction form
   2,478.86/3,720.16 = 919.82/x
3. Step 3: Cross multiply
   2,478.86x = 3,720.16 × 919.82
4. Step 4: Simplify right side
   2,478.86x = 3,421,877.57
5. Step 5: Solve for x
   x = 3,421,877.57/2,478.86
6. Step 6: Final answer
   x = 1,380.42