Finding the Fourth Proportional to 2,925.90, 4,405.86 and 2,109.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,925.90 : 4,405.86 = 2,109.78 : x
2. Step 2: Convert to fraction form
   2,925.90/4,405.86 = 2,109.78/x
3. Step 3: Cross multiply
   2,925.90x = 4,405.86 × 2,109.78
4. Step 4: Simplify right side
   2,925.90x = 9,295,395.31
5. Step 5: Solve for x
   x = 9,295,395.31/2,925.90
6. Step 6: Final answer
   x = 3,176.94