Finding the Fourth Proportional to 64,960.45, 89,707.33 and 61,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,960.45 : 89,707.33 = 61,422.50 : x
2. Step 2: Convert to fraction form
   64,960.45/89,707.33 = 61,422.50/x
3. Step 3: Cross multiply
   64,960.45x = 89,707.33 × 61,422.50
4. Step 4: Simplify right side
   64,960.45x = 5,510,048,777.97
5. Step 5: Solve for x
   x = 5,510,048,777.97/64,960.45
6. Step 6: Final answer
   x = 84,821.60