Finding the Fourth Proportional to 5,123.30, 7,721.86 and 5,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.30 : 7,721.86 = 5,123.30 : x
2. Step 2: Convert to fraction form
   5,123.30/7,721.86 = 5,123.30/x
3. Step 3: Cross multiply
   5,123.30x = 7,721.86 × 5,123.30
4. Step 4: Simplify right side
   5,123.30x = 39,561,379.72
5. Step 5: Solve for x
   x = 39,561,379.72/5,123.30
6. Step 6: Final answer
   x = 7,721.86