Finding the Fourth Proportional to 5,123.56, 7,679.80 and 2,485.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.56 : 7,679.80 = 2,485.50 : x
2. Step 2: Convert to fraction form
   5,123.56/7,679.80 = 2,485.50/x
3. Step 3: Cross multiply
   5,123.56x = 7,679.80 × 2,485.50
4. Step 4: Simplify right side
   5,123.56x = 19,088,142.90
5. Step 5: Solve for x
   x = 19,088,142.90/5,123.56
6. Step 6: Final answer
   x = 3,725.56