Finding the Fourth Proportional to 42,689.06, 63,972.54 and 31,355.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,689.06 : 63,972.54 = 31,355.48 : x
2. Step 2: Convert to fraction form
   42,689.06/63,972.54 = 31,355.48/x
3. Step 3: Cross multiply
   42,689.06x = 63,972.54 × 31,355.48
4. Step 4: Simplify right side
   42,689.06x = 2,005,889,698.52
5. Step 5: Solve for x
   x = 2,005,889,698.52/42,689.06
6. Step 6: Final answer
   x = 46,988.38