Finding the Fourth Proportional to 31,386, 43,316.52 and 18,138

Step by Step Solution

1. Step 1: Write the proportion equation
   31,386 : 43,316.52 = 18,138 : x
2. Step 2: Convert to fraction form
   31,386/43,316.52 = 18,138/x
3. Step 3: Cross multiply
   31,386x = 43,316.52 × 18,138
4. Step 4: Simplify right side
   31,386x = 785,675,039.76
5. Step 5: Solve for x
   x = 785,675,039.76/31,386
6. Step 6: Final answer
   x = 25,032.66