Finding the Fourth Proportional to 3,978.95, 5,490.93 and 2,210.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.95 : 5,490.93 = 2,210.72 : x
2. Step 2: Convert to fraction form
   3,978.95/5,490.93 = 2,210.72/x
3. Step 3: Cross multiply
   3,978.95x = 5,490.93 × 2,210.72
4. Step 4: Simplify right side
   3,978.95x = 12,138,881.31
5. Step 5: Solve for x
   x = 12,138,881.31/3,978.95
6. Step 6: Final answer
   x = 3,050.78