Finding the Fourth Proportional to 120,487.09, 166,290.50 and 76,898.45

Step by Step Solution

1. Step 1: Write the proportion equation
   120,487.09 : 166,290.50 = 76,898.45 : x
2. Step 2: Convert to fraction form
   120,487.09/166,290.50 = 76,898.45/x
3. Step 3: Cross multiply
   120,487.09x = 166,290.50 × 76,898.45
4. Step 4: Simplify right side
   120,487.09x = 12,787,481,730.96
5. Step 5: Solve for x
   x = 12,787,481,730.96/120,487.09
6. Step 6: Final answer
   x = 106,131.55