Finding the Fourth Proportional to 128,020.52, 176,667.93 and 71,431.89

Step by Step Solution

1. Step 1: Write the proportion equation
   128,020.52 : 176,667.93 = 71,431.89 : x
2. Step 2: Convert to fraction form
   128,020.52/176,667.93 = 71,431.89/x
3. Step 3: Cross multiply
   128,020.52x = 176,667.93 × 71,431.89
4. Step 4: Simplify right side
   128,020.52x = 12,619,724,142.29
5. Step 5: Solve for x
   x = 12,619,724,142.29/128,020.52
6. Step 6: Final answer
   x = 98,575.80