Finding the Fourth Proportional to 128,026.72, 191,978.72 and 60,502.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128,026.72 : 191,978.72 = 60,502.56 : x
2. Step 2: Convert to fraction form
   128,026.72/191,978.72 = 60,502.56/x
3. Step 3: Cross multiply
   128,026.72x = 191,978.72 × 60,502.56
4. Step 4: Simplify right side
   128,026.72x = 11,615,204,025.52
5. Step 5: Solve for x
   x = 11,615,204,025.52/128,026.72
6. Step 6: Final answer
   x = 90,724.84