Finding the Fourth Proportional to 212,908.50, 293,815.89 and 128,026.98

Step by Step Solution

1. Step 1: Write the proportion equation
   212,908.50 : 293,815.89 = 128,026.98 : x
2. Step 2: Convert to fraction form
   212,908.50/293,815.89 = 128,026.98/x
3. Step 3: Cross multiply
   212,908.50x = 293,815.89 × 128,026.98
4. Step 4: Simplify right side
   212,908.50x = 37,616,361,072.71
5. Step 5: Solve for x
   x = 37,616,361,072.71/212,908.50
6. Step 6: Final answer
   x = 176,678.53