Finding the Fourth Proportional to 42,731.31, 58,885.97 and 30,772.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,731.31 : 58,885.97 = 30,772.07 : x
2. Step 2: Convert to fraction form
   42,731.31/58,885.97 = 30,772.07/x
3. Step 3: Cross multiply
   42,731.31x = 58,885.97 × 30,772.07
4. Step 4: Simplify right side
   42,731.31x = 1,812,042,742.57
5. Step 5: Solve for x
   x = 1,812,042,742.57/42,731.31
6. Step 6: Final answer
   x = 42,405.50