Finding the Fourth Proportional to 76,308.05, 105,305.11 and 42,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,308.05 : 105,305.11 = 42,321.72 : x
2. Step 2: Convert to fraction form
   76,308.05/105,305.11 = 42,321.72/x
3. Step 3: Cross multiply
   76,308.05x = 105,305.11 × 42,321.72
4. Step 4: Simplify right side
   76,308.05x = 4,456,693,669.08
5. Step 5: Solve for x
   x = 4,456,693,669.08/76,308.05
6. Step 6: Final answer
   x = 58,403.98