Finding the Fourth Proportional to 120,275.89, 165,981.16 and 65,085.21

Step by Step Solution

1. Step 1: Write the proportion equation
   120,275.89 : 165,981.16 = 65,085.21 : x
2. Step 2: Convert to fraction form
   120,275.89/165,981.16 = 65,085.21/x
3. Step 3: Cross multiply
   120,275.89x = 165,981.16 × 65,085.21
4. Step 4: Simplify right side
   120,275.89x = 10,802,918,654.64
5. Step 5: Solve for x
   x = 10,802,918,654.64/120,275.89
6. Step 6: Final answer
   x = 89,817.82