Finding the Fourth Proportional to 123,445.64, 170,428.41 and 78,162.45

Step by Step Solution

1. Step 1: Write the proportion equation
   123,445.64 : 170,428.41 = 78,162.45 : x
2. Step 2: Convert to fraction form
   123,445.64/170,428.41 = 78,162.45/x
3. Step 3: Cross multiply
   123,445.64x = 170,428.41 × 78,162.45
4. Step 4: Simplify right side
   123,445.64x = 13,321,101,436.10
5. Step 5: Solve for x
   x = 13,321,101,436.10/123,445.64
6. Step 6: Final answer
   x = 107,910.67