Finding the Fourth Proportional to 123,636, 185,485.08 and 57,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   123,636 : 185,485.08 = 57,123.20 : x
2. Step 2: Convert to fraction form
   123,636/185,485.08 = 57,123.20/x
3. Step 3: Cross multiply
   123,636x = 185,485.08 × 57,123.20
4. Step 4: Simplify right side
   123,636x = 10,595,501,321.86
5. Step 5: Solve for x
   x = 10,595,501,321.86/123,636
6. Step 6: Final answer
   x = 85,699.16