Finding the Fourth Proportional to 128,117.72, 176,817.46 and 74,405

Step by Step Solution

1. Step 1: Write the proportion equation
   128,117.72 : 176,817.46 = 74,405 : x
2. Step 2: Convert to fraction form
   128,117.72/176,817.46 = 74,405/x
3. Step 3: Cross multiply
   128,117.72x = 176,817.46 × 74,405
4. Step 4: Simplify right side
   128,117.72x = 13,156,103,111.30
5. Step 5: Solve for x
   x = 13,156,103,111.30/128,117.72
6. Step 6: Final answer
   x = 102,687.62