Finding the Fourth Proportional to 123,423.67, 170,330.88 and 72,438.63

Step by Step Solution

1. Step 1: Write the proportion equation
   123,423.67 : 170,330.88 = 72,438.63 : x
2. Step 2: Convert to fraction form
   123,423.67/170,330.88 = 72,438.63/x
3. Step 3: Cross multiply
   123,423.67x = 170,330.88 × 72,438.63
4. Step 4: Simplify right side
   123,423.67x = 12,338,535,593.89
5. Step 5: Solve for x
   x = 12,338,535,593.89/123,423.67
6. Step 6: Final answer
   x = 99,968.96