Finding the Fourth Proportional to 31,100.91, 42,918.40 and 16,953.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,100.91 : 42,918.40 = 16,953.75 : x
2. Step 2: Convert to fraction form
   31,100.91/42,918.40 = 16,953.75/x
3. Step 3: Cross multiply
   31,100.91x = 42,918.40 × 16,953.75
4. Step 4: Simplify right side
   31,100.91x = 727,627,888.91
5. Step 5: Solve for x
   x = 727,627,888.91/31,100.91
6. Step 6: Final answer
   x = 23,395.71