Finding the Fourth Proportional to 42,731.81, 58,886.65 and 30,772.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,731.81 : 58,886.65 = 30,772.57 : x
2. Step 2: Convert to fraction form
   42,731.81/58,886.65 = 30,772.57/x
3. Step 3: Cross multiply
   42,731.81x = 58,886.65 × 30,772.57
4. Step 4: Simplify right side
   42,731.81x = 1,812,093,559.19
5. Step 5: Solve for x
   x = 1,812,093,559.19/42,731.81
6. Step 6: Final answer
   x = 42,406.20