Finding the Fourth Proportional to 72,141.80, 99,540.58 and 42,317.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,141.80 : 99,540.58 = 42,317.80 : x
2. Step 2: Convert to fraction form
   72,141.80/99,540.58 = 42,317.80/x
3. Step 3: Cross multiply
   72,141.80x = 99,540.58 × 42,317.80
4. Step 4: Simplify right side
   72,141.80x = 4,212,338,356.32
5. Step 5: Solve for x
   x = 4,212,338,356.32/72,141.80
6. Step 6: Final answer
   x = 58,389.70