Finding the Fourth Proportional to 128,105, 176,784.85 and 71,516.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128,105 : 176,784.85 = 71,516.37 : x
2. Step 2: Convert to fraction form
   128,105/176,784.85 = 71,516.37/x
3. Step 3: Cross multiply
   128,105x = 176,784.85 × 71,516.37
4. Step 4: Simplify right side
   128,105x = 12,643,010,742.99
5. Step 5: Solve for x
   x = 12,643,010,742.99/128,105
6. Step 6: Final answer
   x = 98,692.56