Finding the Fourth Proportional to 31,103.58, 42,946.47 and 20,508.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,103.58 : 42,946.47 = 20,508.06 : x
2. Step 2: Convert to fraction form
   31,103.58/42,946.47 = 20,508.06/x
3. Step 3: Cross multiply
   31,103.58x = 42,946.47 × 20,508.06
4. Step 4: Simplify right side
   31,103.58x = 880,748,783.55
5. Step 5: Solve for x
   x = 880,748,783.55/31,103.58
6. Step 6: Final answer
   x = 28,316.64