Finding the Fourth Proportional to 3,934.00, 5,428.70 and 2,255.07

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.00 : 5,428.70 = 2,255.07 : x
2. Step 2: Convert to fraction form
   3,934.00/5,428.70 = 2,255.07/x
3. Step 3: Cross multiply
   3,934.00x = 5,428.70 × 2,255.07
4. Step 4: Simplify right side
   3,934.00x = 12,242,098.51
5. Step 5: Solve for x
   x = 12,242,098.51/3,934.00
6. Step 6: Final answer
   x = 3,111.87