Finding the Fourth Proportional to 128,018.43, 176,665.33 and 71,429.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,018.43 : 176,665.33 = 71,429.81 : x
2. Step 2: Convert to fraction form
   128,018.43/176,665.33 = 71,429.81/x
3. Step 3: Cross multiply
   128,018.43x = 176,665.33 × 71,429.81
4. Step 4: Simplify right side
   128,018.43x = 12,619,169,893.59
5. Step 5: Solve for x
   x = 12,619,169,893.59/128,018.43
6. Step 6: Final answer
   x = 98,573.07