Finding the Fourth Proportional to 72,156.78, 99,587.28 and 43,857

Step by Step Solution

1. Step 1: Write the proportion equation
   72,156.78 : 99,587.28 = 43,857 : x
2. Step 2: Convert to fraction form
   72,156.78/99,587.28 = 43,857/x
3. Step 3: Cross multiply
   72,156.78x = 99,587.28 × 43,857
4. Step 4: Simplify right side
   72,156.78x = 4,367,599,338.96
5. Step 5: Solve for x
   x = 4,367,599,338.96/72,156.78
6. Step 6: Final answer
   x = 60,529.30