Finding the Fourth Proportional to 31,386.51, 43,302.96 and 18,643.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,386.51 : 43,302.96 = 18,643.59 : x
2. Step 2: Convert to fraction form
   31,386.51/43,302.96 = 18,643.59/x
3. Step 3: Cross multiply
   31,386.51x = 43,302.96 × 18,643.59
4. Step 4: Simplify right side
   31,386.51x = 807,322,632.03
5. Step 5: Solve for x
   x = 807,322,632.03/31,386.51
6. Step 6: Final answer
   x = 25,721.96