Finding the Fourth Proportional to 42,057.56, 58,043.52 and 31,428.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42,057.56 : 58,043.52 = 31,428.80 : x
2. Step 2: Convert to fraction form
   42,057.56/58,043.52 = 31,428.80/x
3. Step 3: Cross multiply
   42,057.56x = 58,043.52 × 31,428.80
4. Step 4: Simplify right side
   42,057.56x = 1,824,238,181.38
5. Step 5: Solve for x
   x = 1,824,238,181.38/42,057.56
6. Step 6: Final answer
   x = 43,374.80