Finding the Fourth Proportional to 128,499.45, 192,638.37 and 61,986.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,499.45 : 192,638.37 = 61,986.30 : x
2. Step 2: Convert to fraction form
   128,499.45/192,638.37 = 61,986.30/x
3. Step 3: Cross multiply
   128,499.45x = 192,638.37 × 61,986.30
4. Step 4: Simplify right side
   128,499.45x = 11,940,939,794.33
5. Step 5: Solve for x
   x = 11,940,939,794.33/128,499.45
6. Step 6: Final answer
   x = 92,926.00