Finding the Fourth Proportional to 128,941.42, 177,936.27 and 71,577.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128,941.42 : 177,936.27 = 71,577.37 : x
2. Step 2: Convert to fraction form
   128,941.42/177,936.27 = 71,577.37/x
3. Step 3: Cross multiply
   128,941.42x = 177,936.27 × 71,577.37
4. Step 4: Simplify right side
   128,941.42x = 12,736,210,234.21
5. Step 5: Solve for x
   x = 12,736,210,234.21/128,941.42
6. Step 6: Final answer
   x = 98,775.17