Finding the Fourth Proportional to 128,016.51, 176,662.79 and 71,427.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128,016.51 : 176,662.79 = 71,427.88 : x
2. Step 2: Convert to fraction form
   128,016.51/176,662.79 = 71,427.88/x
3. Step 3: Cross multiply
   128,016.51x = 176,662.79 × 71,427.88
4. Step 4: Simplify right side
   128,016.51x = 12,618,648,564.59
5. Step 5: Solve for x
   x = 12,618,648,564.59/128,016.51
6. Step 6: Final answer
   x = 98,570.48