Finding the Fourth Proportional to 128,933.56, 193,069.86 and 76,380.76

Step by Step Solution

1. Step 1: Write the proportion equation
   128,933.56 : 193,069.86 = 76,380.76 : x
2. Step 2: Convert to fraction form
   128,933.56/193,069.86 = 76,380.76/x
3. Step 3: Cross multiply
   128,933.56x = 193,069.86 × 76,380.76
4. Step 4: Simplify right side
   128,933.56x = 14,746,822,639.89
5. Step 5: Solve for x
   x = 14,746,822,639.89/128,933.56
6. Step 6: Final answer
   x = 114,375.36