Finding the Fourth Proportional to 72,474.40, 108,784.56 and 42,921.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,474.40 : 108,784.56 = 42,921.76 : x
2. Step 2: Convert to fraction form
   72,474.40/108,784.56 = 42,921.76/x
3. Step 3: Cross multiply
   72,474.40x = 108,784.56 × 42,921.76
4. Step 4: Simplify right side
   72,474.40x = 4,669,224,776.03
5. Step 5: Solve for x
   x = 4,669,224,776.03/72,474.40
6. Step 6: Final answer
   x = 64,425.85