Finding the Fourth Proportional to 72,313.70, 99,789.99 and 42,099.89

Step by Step Solution

1. Step 1: Write the proportion equation
   72,313.70 : 99,789.99 = 42,099.89 : x
2. Step 2: Convert to fraction form
   72,313.70/99,789.99 = 42,099.89/x
3. Step 3: Cross multiply
   72,313.70x = 99,789.99 × 42,099.89
4. Step 4: Simplify right side
   72,313.70x = 4,201,147,602.10
5. Step 5: Solve for x
   x = 4,201,147,602.10/72,313.70
6. Step 6: Final answer
   x = 58,096.15