Finding the Fourth Proportional to 31,026.50, 42,818.91 and 18,925.90

Step by Step Solution

1. Step 1: Write the proportion equation
   31,026.50 : 42,818.91 = 18,925.90 : x
2. Step 2: Convert to fraction form
   31,026.50/42,818.91 = 18,925.90/x
3. Step 3: Cross multiply
   31,026.50x = 42,818.91 × 18,925.90
4. Step 4: Simplify right side
   31,026.50x = 810,386,301.72
5. Step 5: Solve for x
   x = 810,386,301.72/31,026.50
6. Step 6: Final answer
   x = 26,119.16