Finding the Fourth Proportional to 128,459.10, 177,273.72 and 71,870.52

Step by Step Solution

1. Step 1: Write the proportion equation
   128,459.10 : 177,273.72 = 71,870.52 : x
2. Step 2: Convert to fraction form
   128,459.10/177,273.72 = 71,870.52/x
3. Step 3: Cross multiply
   128,459.10x = 177,273.72 × 71,870.52
4. Step 4: Simplify right side
   128,459.10x = 12,740,754,438.73
5. Step 5: Solve for x
   x = 12,740,754,438.73/128,459.10
6. Step 6: Final answer
   x = 99,181.41