Finding the Fourth Proportional to 42,636.56, 63,999.20 and 31,404.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,636.56 : 63,999.20 = 31,404.58 : x
2. Step 2: Convert to fraction form
   42,636.56/63,999.20 = 31,404.58/x
3. Step 3: Cross multiply
   42,636.56x = 63,999.20 × 31,404.58
4. Step 4: Simplify right side
   42,636.56x = 2,009,867,679.32
5. Step 5: Solve for x
   x = 2,009,867,679.32/42,636.56
6. Step 6: Final answer
   x = 47,139.54