Finding the Fourth Proportional to 31,731.69, 43,789.71 and 18,985.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,731.69 : 43,789.71 = 18,985.40 : x
2. Step 2: Convert to fraction form
   31,731.69/43,789.71 = 18,985.40/x
3. Step 3: Cross multiply
   31,731.69x = 43,789.71 × 18,985.40
4. Step 4: Simplify right side
   31,731.69x = 831,364,941.29
5. Step 5: Solve for x
   x = 831,364,941.29/31,731.69
6. Step 6: Final answer
   x = 26,199.83