Finding the Fourth Proportional to 72,321.20, 99,800.32 and 42,107.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,321.20 : 99,800.32 = 42,107.40 : x
2. Step 2: Convert to fraction form
   72,321.20/99,800.32 = 42,107.40/x
3. Step 3: Cross multiply
   72,321.20x = 99,800.32 × 42,107.40
4. Step 4: Simplify right side
   72,321.20x = 4,202,331,994.37
5. Step 5: Solve for x
   x = 4,202,331,994.37/72,321.20
6. Step 6: Final answer
   x = 58,106.50