Finding the Fourth Proportional to 3,713.76, 5,123.56 and 2,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,713.76 : 5,123.56 = 2,120.50 : x
2. Step 2: Convert to fraction form
   3,713.76/5,123.56 = 2,120.50/x
3. Step 3: Cross multiply
   3,713.76x = 5,123.56 × 2,120.50
4. Step 4: Simplify right side
   3,713.76x = 10,864,472.76
5. Step 5: Solve for x
   x = 10,864,472.76/3,713.76
6. Step 6: Final answer
   x = 2,925.47