Finding the Fourth Proportional to 72,421.36, 99,945.71 and 54,484.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,421.36 : 99,945.71 = 54,484.32 : x
2. Step 2: Convert to fraction form
   72,421.36/99,945.71 = 54,484.32/x
3. Step 3: Cross multiply
   72,421.36x = 99,945.71 × 54,484.32
4. Step 4: Simplify right side
   72,421.36x = 5,445,474,046.27
5. Step 5: Solve for x
   x = 5,445,474,046.27/72,421.36
6. Step 6: Final answer
   x = 75,191.55