Finding the Fourth Proportional to 31,005.82, 42,787.91 and 16,858.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,005.82 : 42,787.91 = 16,858.70 : x
2. Step 2: Convert to fraction form
   31,005.82/42,787.91 = 16,858.70/x
3. Step 3: Cross multiply
   31,005.82x = 42,787.91 × 16,858.70
4. Step 4: Simplify right side
   31,005.82x = 721,348,538.32
5. Step 5: Solve for x
   x = 721,348,538.32/31,005.82
6. Step 6: Final answer
   x = 23,264.94