Finding the Fourth Proportional to 123,842.10, 170,892.63 and 72,856.86

Step by Step Solution

1. Step 1: Write the proportion equation
   123,842.10 : 170,892.63 = 72,856.86 : x
2. Step 2: Convert to fraction form
   123,842.10/170,892.63 = 72,856.86/x
3. Step 3: Cross multiply
   123,842.10x = 170,892.63 × 72,856.86
4. Step 4: Simplify right side
   123,842.10x = 12,450,700,418.94
5. Step 5: Solve for x
   x = 12,450,700,418.94/123,842.10
6. Step 6: Final answer
   x = 100,536.90