Finding the Fourth Proportional to 128,185.72, 176,899.84 and 70,828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,185.72 : 176,899.84 = 70,828.72 : x
2. Step 2: Convert to fraction form
   128,185.72/176,899.84 = 70,828.72/x
3. Step 3: Cross multiply
   128,185.72x = 176,899.84 × 70,828.72
4. Step 4: Simplify right side
   128,185.72x = 12,529,589,235.40
5. Step 5: Solve for x
   x = 12,529,589,235.40/128,185.72
6. Step 6: Final answer
   x = 97,745.59