Finding the Fourth Proportional to 137,724.32, 206,588.72 and 42,957

Step by Step Solution

1. Step 1: Write the proportion equation
   137,724.32 : 206,588.72 = 42,957 : x
2. Step 2: Convert to fraction form
   137,724.32/206,588.72 = 42,957/x
3. Step 3: Cross multiply
   137,724.32x = 206,588.72 × 42,957
4. Step 4: Simplify right side
   137,724.32x = 8,874,431,645.04
5. Step 5: Solve for x
   x = 8,874,431,645.04/137,724.32
6. Step 6: Final answer
   x = 64,436.20