Finding the Fourth Proportional to 123,779.55, 185,639.46 and 57,155.64

Step by Step Solution

1. Step 1: Write the proportion equation
   123,779.55 : 185,639.46 = 57,155.64 : x
2. Step 2: Convert to fraction form
   123,779.55/185,639.46 = 57,155.64/x
3. Step 3: Cross multiply
   123,779.55x = 185,639.46 × 57,155.64
4. Step 4: Simplify right side
   123,779.55x = 10,610,342,145.55
5. Step 5: Solve for x
   x = 10,610,342,145.55/123,779.55
6. Step 6: Final answer
   x = 85,719.67