Finding the Fourth Proportional to 31,101.02, 42,911.76 and 18,998.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,101.02 : 42,911.76 = 18,998.42 : x
2. Step 2: Convert to fraction form
   31,101.02/42,911.76 = 18,998.42/x
3. Step 3: Cross multiply
   31,101.02x = 42,911.76 × 18,998.42
4. Step 4: Simplify right side
   31,101.02x = 815,255,639.42
5. Step 5: Solve for x
   x = 815,255,639.42/31,101.02
6. Step 6: Final answer
   x = 26,213.15