Finding the Fourth Proportional to 128,942.52, 177,941.22 and 72,354.12

Step by Step Solution

1. Step 1: Write the proportion equation
   128,942.52 : 177,941.22 = 72,354.12 : x
2. Step 2: Convert to fraction form
   128,942.52/177,941.22 = 72,354.12/x
3. Step 3: Cross multiply
   128,942.52x = 177,941.22 × 72,354.12
4. Step 4: Simplify right side
   128,942.52x = 12,874,780,384.83
5. Step 5: Solve for x
   x = 12,874,780,384.83/128,942.52
6. Step 6: Final answer
   x = 99,848.99