Finding the Fourth Proportional to 215,428.55, 323,189.33 and 65,664.81

Step by Step Solution

1. Step 1: Write the proportion equation
   215,428.55 : 323,189.33 = 65,664.81 : x
2. Step 2: Convert to fraction form
   215,428.55/323,189.33 = 65,664.81/x
3. Step 3: Cross multiply
   215,428.55x = 323,189.33 × 65,664.81
4. Step 4: Simplify right side
   215,428.55x = 21,222,165,620.15
5. Step 5: Solve for x
   x = 21,222,165,620.15/215,428.55
6. Step 6: Final answer
   x = 98,511.39