Finding the Fourth Proportional to 128,754.35, 177,677.82 and 71,393.89

Step by Step Solution

1. Step 1: Write the proportion equation
   128,754.35 : 177,677.82 = 71,393.89 : x
2. Step 2: Convert to fraction form
   128,754.35/177,677.82 = 71,393.89/x
3. Step 3: Cross multiply
   128,754.35x = 177,677.82 × 71,393.89
4. Step 4: Simplify right side
   128,754.35x = 12,685,110,736.52
5. Step 5: Solve for x
   x = 12,685,110,736.52/128,754.35
6. Step 6: Final answer
   x = 98,521.80