Finding the Fourth Proportional to 128,730.83, 193,108.71 and 39,960.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,730.83 : 193,108.71 = 39,960.50 : x
2. Step 2: Convert to fraction form
   128,730.83/193,108.71 = 39,960.50/x
3. Step 3: Cross multiply
   128,730.83x = 193,108.71 × 39,960.50
4. Step 4: Simplify right side
   128,730.83x = 7,716,719,440.61
5. Step 5: Solve for x
   x = 7,716,719,440.61/128,730.83
6. Step 6: Final answer
   x = 59,944.61