Finding the Fourth Proportional to 128,735.14, 177,654.71 and 72,146.51

Step by Step Solution

1. Step 1: Write the proportion equation
   128,735.14 : 177,654.71 = 72,146.51 : x
2. Step 2: Convert to fraction form
   128,735.14/177,654.71 = 72,146.51/x
3. Step 3: Cross multiply
   128,735.14x = 177,654.71 × 72,146.51
4. Step 4: Simplify right side
   128,735.14x = 12,817,166,950.83
5. Step 5: Solve for x
   x = 12,817,166,950.83/128,735.14
6. Step 6: Final answer
   x = 99,562.31