Finding the Fourth Proportional to 85,665.69, 128,483.06 and 23,321.61

Step by Step Solution

1. Step 1: Write the proportion equation
   85,665.69 : 128,483.06 = 23,321.61 : x
2. Step 2: Convert to fraction form
   85,665.69/128,483.06 = 23,321.61/x
3. Step 3: Cross multiply
   85,665.69x = 128,483.06 × 23,321.61
4. Step 4: Simplify right side
   85,665.69x = 2,996,431,700.32
5. Step 5: Solve for x
   x = 2,996,431,700.32/85,665.69
6. Step 6: Final answer
   x = 34,978.20