Finding the Fourth Proportional to 42,639.60, 58,846.88 and 31,865.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,639.60 : 58,846.88 = 31,865.76 : x
2. Step 2: Convert to fraction form
   42,639.60/58,846.88 = 31,865.76/x
3. Step 3: Cross multiply
   42,639.60x = 58,846.88 × 31,865.76
4. Step 4: Simplify right side
   42,639.60x = 1,875,200,554.83
5. Step 5: Solve for x
   x = 1,875,200,554.83/42,639.60
6. Step 6: Final answer
   x = 43,977.91