Finding the Fourth Proportional to 31,390.50, 43,322.74 and 18,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,390.50 : 43,322.74 = 18,142.50 : x
2. Step 2: Convert to fraction form
   31,390.50/43,322.74 = 18,142.50/x
3. Step 3: Cross multiply
   31,390.50x = 43,322.74 × 18,142.50
4. Step 4: Simplify right side
   31,390.50x = 785,982,810.45
5. Step 5: Solve for x
   x = 785,982,810.45/31,390.50
6. Step 6: Final answer
   x = 25,038.88