Finding the Fourth Proportional to 31,036.65, 42,830.42 and 16,889.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,036.65 : 42,830.42 = 16,889.60 : x
2. Step 2: Convert to fraction form
   31,036.65/42,830.42 = 16,889.60/x
3. Step 3: Cross multiply
   31,036.65x = 42,830.42 × 16,889.60
4. Step 4: Simplify right side
   31,036.65x = 723,388,363.03
5. Step 5: Solve for x
   x = 723,388,363.03/31,036.65
6. Step 6: Final answer
   x = 23,307.55