Finding the Fourth Proportional to 31,068.61, 42,872.62 and 18,321.17

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.61 : 42,872.62 = 18,321.17 : x
2. Step 2: Convert to fraction form
   31,068.61/42,872.62 = 18,321.17/x
3. Step 3: Cross multiply
   31,068.61x = 42,872.62 × 18,321.17
4. Step 4: Simplify right side
   31,068.61x = 785,476,559.37
5. Step 5: Solve for x
   x = 785,476,559.37/31,068.61
6. Step 6: Final answer
   x = 25,282.00