Finding the Fourth Proportional to 31,389.98, 43,298.98 and 18,634.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,389.98 : 43,298.98 = 18,634.50 : x
2. Step 2: Convert to fraction form
   31,389.98/43,298.98 = 18,634.50/x
3. Step 3: Cross multiply
   31,389.98x = 43,298.98 × 18,634.50
4. Step 4: Simplify right side
   31,389.98x = 806,854,796.22
5. Step 5: Solve for x
   x = 806,854,796.22/31,389.98
6. Step 6: Final answer
   x = 25,704.22