Finding the Fourth Proportional to 72,379.20, 108,532.35 and 42,806.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,379.20 : 108,532.35 = 42,806.10 : x
2. Step 2: Convert to fraction form
   72,379.20/108,532.35 = 42,806.10/x
3. Step 3: Cross multiply
   72,379.20x = 108,532.35 × 42,806.10
4. Step 4: Simplify right side
   72,379.20x = 4,645,846,627.34
5. Step 5: Solve for x
   x = 4,645,846,627.34/72,379.20
6. Step 6: Final answer
   x = 64,187.59