Finding the Fourth Proportional to 128,016.89, 191,943.12 and 53,188.73

Step by Step Solution

1. Step 1: Write the proportion equation
   128,016.89 : 191,943.12 = 53,188.73 : x
2. Step 2: Convert to fraction form
   128,016.89/191,943.12 = 53,188.73/x
3. Step 3: Cross multiply
   128,016.89x = 191,943.12 × 53,188.73
4. Step 4: Simplify right side
   128,016.89x = 10,209,210,785.04
5. Step 5: Solve for x
   x = 10,209,210,785.04/128,016.89
6. Step 6: Final answer
   x = 79,748.94