Finding the Fourth Proportional to 12,779.31, 19,168.50 and 4,459.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,779.31 : 19,168.50 = 4,459.32 : x
2. Step 2: Convert to fraction form
   12,779.31/19,168.50 = 4,459.32/x
3. Step 3: Cross multiply
   12,779.31x = 19,168.50 × 4,459.32
4. Step 4: Simplify right side
   12,779.31x = 85,478,475.42
5. Step 5: Solve for x
   x = 85,478,475.42/12,779.31
6. Step 6: Final answer
   x = 6,688.82