Finding the Fourth Proportional to 123,215.48, 170,005.16 and 72,200.88

Step by Step Solution

1. Step 1: Write the proportion equation
   123,215.48 : 170,005.16 = 72,200.88 : x
2. Step 2: Convert to fraction form
   123,215.48/170,005.16 = 72,200.88/x
3. Step 3: Cross multiply
   123,215.48x = 170,005.16 × 72,200.88
4. Step 4: Simplify right side
   123,215.48x = 12,274,522,156.54
5. Step 5: Solve for x
   x = 12,274,522,156.54/123,215.48
6. Step 6: Final answer
   x = 99,618.34