Finding the Fourth Proportional to 72,097.12, 99,353.48 and 51,915.90

Step by Step Solution

1. Step 1: Write the proportion equation
   72,097.12 : 99,353.48 = 51,915.90 : x
2. Step 2: Convert to fraction form
   72,097.12/99,353.48 = 51,915.90/x
3. Step 3: Cross multiply
   72,097.12x = 99,353.48 × 51,915.90
4. Step 4: Simplify right side
   72,097.12x = 5,158,024,835.56
5. Step 5: Solve for x
   x = 5,158,024,835.56/72,097.12
6. Step 6: Final answer
   x = 71,542.73