Finding the Fourth Proportional to 78,991.92, 108,938.20 and 65,541.84

Step by Step Solution

1. Step 1: Write the proportion equation
   78,991.92 : 108,938.20 = 65,541.84 : x
2. Step 2: Convert to fraction form
   78,991.92/108,938.20 = 65,541.84/x
3. Step 3: Cross multiply
   78,991.92x = 108,938.20 × 65,541.84
4. Step 4: Simplify right side
   78,991.92x = 7,140,010,074.29
5. Step 5: Solve for x
   x = 7,140,010,074.29/78,991.92
6. Step 6: Final answer
   x = 90,389.12