Finding the Fourth Proportional to 123,870.64, 185,655.84 and 57,172

Step by Step Solution

1. Step 1: Write the proportion equation
   123,870.64 : 185,655.84 = 57,172 : x
2. Step 2: Convert to fraction form
   123,870.64/185,655.84 = 57,172/x
3. Step 3: Cross multiply
   123,870.64x = 185,655.84 × 57,172
4. Step 4: Simplify right side
   123,870.64x = 10,614,315,684.48
5. Step 5: Solve for x
   x = 10,614,315,684.48/123,870.64
6. Step 6: Final answer
   x = 85,688.71