Finding the Fourth Proportional to 72,439.61, 99,943.04 and 42,218.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,439.61 : 99,943.04 = 42,218.02 : x
2. Step 2: Convert to fraction form
   72,439.61/99,943.04 = 42,218.02/x
3. Step 3: Cross multiply
   72,439.61x = 99,943.04 × 42,218.02
4. Step 4: Simplify right side
   72,439.61x = 4,219,396,550.78
5. Step 5: Solve for x
   x = 4,219,396,550.78/72,439.61
6. Step 6: Final answer
   x = 58,247.09