Finding the Fourth Proportional to 123,779.99, 185,640.12 and 57,156.07

Step by Step Solution

1. Step 1: Write the proportion equation
   123,779.99 : 185,640.12 = 57,156.07 : x
2. Step 2: Convert to fraction form
   123,779.99/185,640.12 = 57,156.07/x
3. Step 3: Cross multiply
   123,779.99x = 185,640.12 × 57,156.07
4. Step 4: Simplify right side
   123,779.99x = 10,610,459,693.53
5. Step 5: Solve for x
   x = 10,610,459,693.53/123,779.99
6. Step 6: Final answer
   x = 85,720.31