Finding the Fourth Proportional to 42,109.86, 58,064.41 and 28,688.97

Step by Step Solution

1. Step 1: Write the proportion equation
   42,109.86 : 58,064.41 = 28,688.97 : x
2. Step 2: Convert to fraction form
   42,109.86/58,064.41 = 28,688.97/x
3. Step 3: Cross multiply
   42,109.86x = 58,064.41 × 28,688.97
4. Step 4: Simplify right side
   42,109.86x = 1,665,808,116.56
5. Step 5: Solve for x
   x = 1,665,808,116.56/42,109.86
6. Step 6: Final answer
   x = 39,558.62