Finding the Fourth Proportional to 72,399.13, 99,902.73 and 42,178.13

Step by Step Solution

1. Step 1: Write the proportion equation
   72,399.13 : 99,902.73 = 42,178.13 : x
2. Step 2: Convert to fraction form
   72,399.13/99,902.73 = 42,178.13/x
3. Step 3: Cross multiply
   72,399.13x = 99,902.73 × 42,178.13
4. Step 4: Simplify right side
   72,399.13x = 4,213,710,928.54
5. Step 5: Solve for x
   x = 4,213,710,928.54/72,399.13
6. Step 6: Final answer
   x = 58,201.12