Finding the Fourth Proportional to 72,320.57, 99,808.56 and 42,115.37

Step by Step Solution

1. Step 1: Write the proportion equation
   72,320.57 : 99,808.56 = 42,115.37 : x
2. Step 2: Convert to fraction form
   72,320.57/99,808.56 = 42,115.37/x
3. Step 3: Cross multiply
   72,320.57x = 99,808.56 × 42,115.37
4. Step 4: Simplify right side
   72,320.57x = 4,203,473,934.52
5. Step 5: Solve for x
   x = 4,203,473,934.52/72,320.57
6. Step 6: Final answer
   x = 58,122.80