Finding the Fourth Proportional to 31,078.22, 42,886.71 and 18,998.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.22 : 42,886.71 = 18,998.93 : x
2. Step 2: Convert to fraction form
   31,078.22/42,886.71 = 18,998.93/x
3. Step 3: Cross multiply
   31,078.22x = 42,886.71 × 18,998.93
4. Step 4: Simplify right side
   31,078.22x = 814,801,601.22
5. Step 5: Solve for x
   x = 814,801,601.22/31,078.22
6. Step 6: Final answer
   x = 26,217.77