Finding the Fourth Proportional to 72,431.29, 99,967.62 and 42,234.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72,431.29 : 99,967.62 = 42,234.31 : x
2. Step 2: Convert to fraction form
   72,431.29/99,967.62 = 42,234.31/x
3. Step 3: Cross multiply
   72,431.29x = 99,967.62 × 42,234.31
4. Step 4: Simplify right side
   72,431.29x = 4,222,063,453.04
5. Step 5: Solve for x
   x = 4,222,063,453.04/72,431.29
6. Step 6: Final answer
   x = 58,290.60