Finding the Fourth Proportional to 123,779.49, 185,639.37 and 57,155.58

Step by Step Solution

1. Step 1: Write the proportion equation
   123,779.49 : 185,639.37 = 57,155.58 : x
2. Step 2: Convert to fraction form
   123,779.49/185,639.37 = 57,155.58/x
3. Step 3: Cross multiply
   123,779.49x = 185,639.37 × 57,155.58
4. Step 4: Simplify right side
   123,779.49x = 10,610,325,863.18
5. Step 5: Solve for x
   x = 10,610,325,863.18/123,779.49
6. Step 6: Final answer
   x = 85,719.58