Finding the Fourth Proportional to 100,185, 138,270.92 and 57,164.43

Step by Step Solution

1. Step 1: Write the proportion equation
   100,185 : 138,270.92 = 57,164.43 : x
2. Step 2: Convert to fraction form
   100,185/138,270.92 = 57,164.43/x
3. Step 3: Cross multiply
   100,185x = 138,270.92 × 57,164.43
4. Step 4: Simplify right side
   100,185x = 7,904,178,041.55
5. Step 5: Solve for x
   x = 7,904,178,041.55/100,185
6. Step 6: Final answer
   x = 78,895.82