Finding the Fourth Proportional to 72,018.32, 99,507.08 and 51,835.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,018.32 : 99,507.08 = 51,835.28 : x
2. Step 2: Convert to fraction form
   72,018.32/99,507.08 = 51,835.28/x
3. Step 3: Cross multiply
   72,018.32x = 99,507.08 × 51,835.28
4. Step 4: Simplify right side
   72,018.32x = 5,157,977,353.78
5. Step 5: Solve for x
   x = 5,157,977,353.78/72,018.32
6. Step 6: Final answer
   x = 71,620.35