Finding the Fourth Proportional to 128,427.72, 177,222.72 and 71,063.76

Step by Step Solution

1. Step 1: Write the proportion equation
   128,427.72 : 177,222.72 = 71,063.76 : x
2. Step 2: Convert to fraction form
   128,427.72/177,222.72 = 71,063.76/x
3. Step 3: Cross multiply
   128,427.72x = 177,222.72 × 71,063.76
4. Step 4: Simplify right side
   128,427.72x = 12,594,112,840.63
5. Step 5: Solve for x
   x = 12,594,112,840.63/128,427.72
6. Step 6: Final answer
   x = 98,063.82