Finding the Fourth Proportional to 42,389.55, 58,465.89 and 28,939.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,389.55 : 58,465.89 = 28,939.50 : x
2. Step 2: Convert to fraction form
   42,389.55/58,465.89 = 28,939.50/x
3. Step 3: Cross multiply
   42,389.55x = 58,465.89 × 28,939.50
4. Step 4: Simplify right side
   42,389.55x = 1,691,973,623.66
5. Step 5: Solve for x
   x = 1,691,973,623.66/42,389.55
6. Step 6: Final answer
   x = 39,914.88