Finding the Fourth Proportional to 123,769, 185,623.72 and 57,145.12

Step by Step Solution

1. Step 1: Write the proportion equation
   123,769 : 185,623.72 = 57,145.12 : x
2. Step 2: Convert to fraction form
   123,769/185,623.72 = 57,145.12/x
3. Step 3: Cross multiply
   123,769x = 185,623.72 × 57,145.12
4. Step 4: Simplify right side
   123,769x = 10,607,489,754.25
5. Step 5: Solve for x
   x = 10,607,489,754.25/123,769
6. Step 6: Final answer
   x = 85,703.93