Finding the Fourth Proportional to 123,563.76, 170,536.20 and 78,245.88

Step by Step Solution

1. Step 1: Write the proportion equation
   123,563.76 : 170,536.20 = 78,245.88 : x
2. Step 2: Convert to fraction form
   123,563.76/170,536.20 = 78,245.88/x
3. Step 3: Cross multiply
   123,563.76x = 170,536.20 × 78,245.88
4. Step 4: Simplify right side
   123,563.76x = 13,343,755,040.86
5. Step 5: Solve for x
   x = 13,343,755,040.86/123,563.76
6. Step 6: Final answer
   x = 107,990.85