Finding the Fourth Proportional to 5,123.01, 7,679.72 and 2,779.58

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.01 : 7,679.72 = 2,779.58 : x
2. Step 2: Convert to fraction form
   5,123.01/7,679.72 = 2,779.58/x
3. Step 3: Cross multiply
   5,123.01x = 7,679.72 × 2,779.58
4. Step 4: Simplify right side
   5,123.01x = 21,346,343.82
5. Step 5: Solve for x
   x = 21,346,343.82/5,123.01
6. Step 6: Final answer
   x = 4,166.76