Finding the Fourth Proportional to 72,019.32, 99,508.46 and 51,836.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,019.32 : 99,508.46 = 51,836.28 : x
2. Step 2: Convert to fraction form
   72,019.32/99,508.46 = 51,836.28/x
3. Step 3: Cross multiply
   72,019.32x = 99,508.46 × 51,836.28
4. Step 4: Simplify right side
   72,019.32x = 5,158,148,394.93
5. Step 5: Solve for x
   x = 5,158,148,394.93/72,019.32
6. Step 6: Final answer
   x = 71,621.73