Finding the Fourth Proportional to 206,909.42, 310,357.98 and 57,158.72

Step by Step Solution

1. Step 1: Write the proportion equation
   206,909.42 : 310,357.98 = 57,158.72 : x
2. Step 2: Convert to fraction form
   206,909.42/310,357.98 = 57,158.72/x
3. Step 3: Cross multiply
   206,909.42x = 310,357.98 × 57,158.72
4. Step 4: Simplify right side
   206,909.42x = 17,739,664,878.59
5. Step 5: Solve for x
   x = 17,739,664,878.59/206,909.42
6. Step 6: Final answer
   x = 85,736.38