Finding the Fourth Proportional to 216,111.43, 324,097.05 and 71,978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   216,111.43 : 324,097.05 = 71,978.89 : x
2. Step 2: Convert to fraction form
   216,111.43/324,097.05 = 71,978.89/x
3. Step 3: Cross multiply
   216,111.43x = 324,097.05 × 71,978.89
4. Step 4: Simplify right side
   216,111.43x = 23,328,145,911.27
5. Step 5: Solve for x
   x = 23,328,145,911.27/216,111.43
6. Step 6: Final answer
   x = 107,944.99