Finding the Fourth Proportional to 128,654.84, 177,543.42 and 72,065

Step by Step Solution

1. Step 1: Write the proportion equation
   128,654.84 : 177,543.42 = 72,065 : x
2. Step 2: Convert to fraction form
   128,654.84/177,543.42 = 72,065/x
3. Step 3: Cross multiply
   128,654.84x = 177,543.42 × 72,065
4. Step 4: Simplify right side
   128,654.84x = 12,794,666,562.30
5. Step 5: Solve for x
   x = 12,794,666,562.30/128,654.84
6. Step 6: Final answer
   x = 99,449.55