Finding the Fourth Proportional to 123,468, 170,424.72 and 78,756

Step by Step Solution

1. Step 1: Write the proportion equation
   123,468 : 170,424.72 = 78,756 : x
2. Step 2: Convert to fraction form
   123,468/170,424.72 = 78,756/x
3. Step 3: Cross multiply
   123,468x = 170,424.72 × 78,756
4. Step 4: Simplify right side
   123,468x = 13,421,969,248.32
5. Step 5: Solve for x
   x = 13,421,969,248.32/123,468
6. Step 6: Final answer
   x = 108,708.08