Finding the Fourth Proportional to 128,751, 177,661.98 and 72,154.20

Step by Step Solution

1. Step 1: Write the proportion equation
   128,751 : 177,661.98 = 72,154.20 : x
2. Step 2: Convert to fraction form
   128,751/177,661.98 = 72,154.20/x
3. Step 3: Cross multiply
   128,751x = 177,661.98 × 72,154.20
4. Step 4: Simplify right side
   128,751x = 12,819,058,037.32
5. Step 5: Solve for x
   x = 12,819,058,037.32/128,751
6. Step 6: Final answer
   x = 99,564.73