Finding the Fourth Proportional to 123,524.77, 170,401.57 and 78,126.30

Step by Step Solution

1. Step 1: Write the proportion equation
   123,524.77 : 170,401.57 = 78,126.30 : x
2. Step 2: Convert to fraction form
   123,524.77/170,401.57 = 78,126.30/x
3. Step 3: Cross multiply
   123,524.77x = 170,401.57 × 78,126.30
4. Step 4: Simplify right side
   123,524.77x = 13,312,844,178.29
5. Step 5: Solve for x
   x = 13,312,844,178.29/123,524.77
6. Step 6: Final answer
   x = 107,774.69