Finding the Fourth Proportional to 128,667.29, 177,555.67 and 71,307.45

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.29 : 177,555.67 = 71,307.45 : x
2. Step 2: Convert to fraction form
   128,667.29/177,555.67 = 71,307.45/x
3. Step 3: Cross multiply
   128,667.29x = 177,555.67 × 71,307.45
4. Step 4: Simplify right side
   128,667.29x = 12,661,042,060.74
5. Step 5: Solve for x
   x = 12,661,042,060.74/128,667.29
6. Step 6: Final answer
   x = 98,401.40